Dyson Purifier Hot+Cool Formaldehyde

2 month update – I thought I would provide a 2nd update review after 2 months of use, basically, this little unit has replaced our reverse cycle airconditioner in our bedroom which is about 30 square metres in an old 1880's terrace house yes, we have roof insulation but it's still a cold house with old double french doors so what we call a cold bedroom. Easy of… Read more

use: Amazingly easy to use, a small control panel with colour LED display on the unit itself or a easy to use remote control which magnetically attaches to the top of the unit. Filters are easy to install/remove for cleaning although after two months have not required cleaning, I have checked.

Actual use: Fast heating with even fan rotating the head unit around 180 degrees with virtually no noise. Most impressive heating it takes the chill off the room in just a couple of minutes and fully adjustable heating temperature provides economical heat settings automatically.

Love the little remote, this means sitting up in bed can take the temperature up or down as required with a press of the button, easy use and quiet function of the unit itself. There is a Dyson App to use with the unit which connects easily but have found quicker and easier just using the remote or the digital display panel on the unit. This also works as a cooler in summer but have not tried this function

Economy: Not seen any spike in electricity bills if anything gone down a little probably as we do not use the reverse cycle air conditioner anymore, we love this unit it performs well for our bedroom but Dyson advertisers can be used in any room, I don't doubt it one bit, our only other Dyson product is a stick vacuum Animal V7 which is awesome too, however not overly keen on the top end products as expensive versus real-world use is not fantastic value in our minds. That said this unit does replace our reverse cycle air conditioner so can see value in its purchase.

Air Quality: Our bedroom varies in odour throughout the year, even with the double french doors open for airing over time odour is back again, unsure of what it is but given its a very old house could be anything!

Within 30 minutes of use notice a change in odour going down and lessening, that said ongoing use we have noticed no odour in the room at all, we walk in the room and nothing just a faint waft of Jasmin from our scent sticks.

Overall we love our Dyson Air Purifier but use it more for a heater than an air purifier but its a pleasant side effect for us to have a clear odourless room

Another example of a great Dyson machine – Dyson Purifier Hot+Cool Formaldehyde HP09 Review Enter photo here of Dyson at wall Pros Powerful purification down to PM (Particle Measure) 0.1 micron via HEPA/Carbon Filter and Selective Catalytic Oxidation Filter Smart control of purification with the Dyson Link App, Amazon Alexa, Siri and Google Assistant Display of real-time air quality on… Read more

the LCD and mobile Heats and cools

Cons

Purchase cost is the reason for only four stars! Cost of filter changes

RRP

$999, time-limited deals seen down to $750

An easy choice

Dyson provided this expensive unit to us for testing, and we certainly were not disappointed with the performance. Why Formaldehyde? Had to read up about it. Formaldehyde (carcinogenic) is given off by smoke and building materials, like flooring, furniture, woods, fabrics, glues and paints in new and old buildings and Dyson should perhaps emphasize the carcinogenic point more. Having just moved into a brand-new home we were looking for new appliances in several shops. The working Dyson fans there are a magnet with their “bladeless” fans and are starting from around $500 with the costs increasing as more features are added and with this top-of-the-range model adding a catalytic filter, which converts Formaldehyde into CO2 and water for about an extra $250. Our new house features extensive hybrid flooring and application of paints plus we moved into the inner city with lots of traffic, so this air purifier was a fortuitous addition. My wife is also concerned about pollen and dust settling visibly on our polished furniture and there has been a marked improvement.

First Impressions

A rather tall box arrived, and its four sides displayed a lot of interesting technical detail, which was not found in the brief documentation. Perhaps this box should be placed next to fans in shops. The box contained the unit, four loose filters, a magnetic remote and a small installation manual. Installation just requires opening the shrouds at the side and clicking in the four filters.

Enter photo here of filters

The manual suggested moving the unit away from draughts and in our case a large window would have caused colder and heavier air being assisted by the fan in dropping there, so the unit was moved next to a brick wall in preference.

The Dyson Link app was downloaded and surprises with its many controlling functions and reports and is easier to use than this very small magnetic remote.

Enter photo here of Dyson remote

The unit can also be controlled via Amazon Alexa, Siri and Google Assistant, but our house has not been automated to that extent to test those features.

After switching the unit on, it can be set to “Auto” mode to let the sensors look after the air quality in the room. Interesting to see the fan speed changing to changes in the environment. It is also interesting to see the air quality deteriorating on the small LCD or smart phone during cooking or when smoke is being generated, but the unit removes those smells quickly. Opening the door once to the street and exhaust fumes at the 4PM rush hour got reported as a kick in the NO2 levels on the smartphone,

Enter photo here of NO2 spike, two photos were sent

It being winter I was more worried about the room temperature, so I immediately set the temperature to 23 degrees and the airflow speed to a level which did not interfere with the TV’s audio signal. At Level 1 in the wind speed settings the noise being generated is barely audible, but at level 10 the noise becomes a dominant factor in the room.

The compliance plate lists 2,050W as the maximum draw but at level 4 of the wind speed and heating set to 23 degrees in a room of 19 degrees the Dyson draws 2,444W as measured with an Arlec energy smart meter, With 10.6A this is getting beyond the maximum of a 10A plug. At tornado level 10 the unit drew 3,200W or well beyond what the compliance plate says and the Arlec emitted a loud pop but survived. Dyson may have to look into it.

Enter photo here of 2,444W

The heating provided at that level is impressive. Running it at wind speed level 4 for heating costs about $0.60/hr but is still cheaper than switching on our air conditioner at 3.300W. Using the app means I can preheat a room before I get out of bed or heat a room before arriving at home. Once the required temperature is reached, the sensor switches the ceramic heating plates off and reduces the wind speed to Level 1, which then only draws 5.8 Watts, but still purifies the air.

Enter photo here of 5.8 Watts

Cooling is not achieved via a noisy compressor but a Peltier unit (thermoelectric cooler), so the only noise is coming from the fan. Unlike for heating, it is not possible to dial in a desired temperature.

The unit is quite a stylish bit of furniture with its golden base and white “bladeless fan” at the top and any visitors to the house will comment on it. “Bladeless” is an advertising misnomer as the airflow-generating ring is inside the pedestal making it safe from small hands and a venturi-shaped oval draws in extra air, which Dyson calls the “air multiplier technology”.

Dyson models features a two-year guarantee after registration.

Design and HEPA (High-Efficiency Particulate Air) H13 Purifier Explanation

Two inner activated carbon filters capture gases and two outer HEPA H13 filters capture particulate matter, and two selective catalytic oxidisation filters remove Formaldehyde. HEPA is an international efficiency standard of air filters. Commenting on air purification levels needs scientific instruments, but after testing this unit for one month only and seeing less dust and the wife being happy, I am happy. As Dyson air purifiers have been tested against European HEPA standards, I must believe their advertising claims of the removal of 99.95% of particles as small as 0.1 microns, described as PM (Particle Measure) 0.1, where a micron (um or μm) is a thousandth of a millimetre and here it gets interesting:

PM10 particles (100 times larger) and PM2.5 (25 times larger) than PM0.1 are already small enough to enter your lungs and throat and can make you cough, your nose run and eyes sting (Source: Victorian Health Department). HEPA filters are medical grade filters and used for contamination control in the manufacture of semiconductors, hard disk drives, food and pharmaceutical products as well as hospitals. The particulate sensor uses laser measurement to report on PM2.5 and PM10.

The Wikipedia entry for HEPA lists the sizes of bacteria (0.2-2.0 um), virus (0.02-0.3 um) and submicron liquid aerosols at 0.02-0.5 micron. HEPA- compliant filters like this Dyson unit are able to capture some viruses and bacteria which are ≤0.3 μm. It is interesting to read that the size of the aerosols of Covid is between 0.05 and 0.2 μm, so it will even catch at least part of that virus; don't take my word for it, I am not a doctor!

The Dyson air purifier contains four sensors, including a solid-state Formaldehyde sensor, which lasts a lifetime. The software uses an algorithm for precise air quality monitoring and reporting. The LCD and app reports air quality on a 24-hour review basis, temperature, Formaldehyde, PM 2.5 and PM 10, NO2 (Nitrogen Dioxide), and VOC levels.

The HEPA + Carbon filter combination retails at $99 and the app shows in graphical form when it is time to replace, and I estimate the life to be one year.

Detailed Features

The Dyson Link app and the remote can be used to switch the unit on/off, set cooling or heating and desired heating temperature, airflow speed, oscillation, timer, night mode, auto mode, information and airflow direction. Oscillation starting point is set via moving the circle and the angle can be set to 45, 90, 180 and 350 degrees.

Enclose photo of oscillation ex smartphone https://youtu.be/3VhkLAL0u8g

Additional screens display the current room temperature, humidity, filter life and WiFi status. Continuous monitoring can be set to display environmental data when air is passing through it and to check what is making your air dirty. Timer setting means a weekly schedule can be set to turn your machine on at specific times and with your preferred settings.

VOCs (Volatile Organic Compounds) are nasty chemicals found in cleaning products, old furniture, burning fuel and even perfume. A list of VOCs is listed on the side of the unit, of which Benzene is probably the best known. The display of VOCs allows you to react to changes. You may be cleaning and notice a spike in the VOCs giving you the clue to change cleaners. The level of VOCs is displayed on the LCD and on your smart phone via a colour scale, green denotes “good” between 0-3, “fair” at yellow 4-6, “poor” at orange 7-8 and “very poor” at 9+.

Enter photo headed "Good" showing VOC level

For our room, PM2.5, PM10 and VOC levels are in the green range, showing that the house is odour and dust free. Formaldehyde levels in this new house are in the poor range and clicking on HCHO reveals between 0.3-0.499 mg/m3 of Formaldehyde. Another display lists the given city’s temperature, humidity and VOC level and swiping it lists PM2.5, PM10 and NO2 level in parts/billion.

Enter photo of showing Perth PM2.5, etc.,

Shows the PM2.5 level in Perth at 9 micro grams of dust per m3 of air, PM10 at 41 and NO2 levels at 30 parts/billion.

You can use the fan icon to select one of ten speeds available. The temperature icon can be set from one degree Celsius to 37C and when the temperature is achieved, the fan will switch to the lowest speed automatically, so this Dyson unit can be used like a room thermostat.

Auto mode will adjust the fan speed automatically and keep the air comfortable and clean. As the environment changes, the fan speed will vary during the day. A further option is focused mode and diffused mode for the air flow. Diffused mode is only available in Cool mode and blows out from the rear and means the blast of air is not directed at you.

Night-time mode runs the very quiet fan at a maximum speed of four and reduces the LCD brightness. Timer mode runs a countdown timer with a choice of ½ an hour, one, two, four and eight hours.

Conclusion

Commenting on improvements to health after one month is difficult and I fortunately do not suffer from any respiratory ailments despite having lived next to a quarry, where PM10 levels regularly spiked up to more than 100 micro grams of dust/m3 of air, this air purifier would have been a godsend. A question to you: Are you suffering from hay fever when the pollen count goes up? Do you live next to a busy highway like I do? Do you suffer from unexplained headaches after using strong cleaning materials or suspect you are suffering from allergens? Sure, this top-of-the-range model from Dyson is rather pricey, but considering that it purifies down to a very low level of PM0.1, heats and cools and removes Formaldehyde makes it a worthwhile purchase. If the removal of Formaldehyde is not an issue, then Dyson certainly has less expensive models without this feature.

Almost perfect, works for us :) Mobile and efficient – I received this unit 18th June, as a part of an Ambassador review program. Yes, the packaging is exceptionally good but its what’s inside I love. My husband and I live fulltime in our home (with two small dogs). I've suffered from many allergies over the years mainly skin related problems we also have daughters who suffer different complaints,… Read more

one suffers badly from Eczema, the other is a borderline asthmatic, we regularly try things to reduce these issues (sometimes without success) but this machine looks promising.

Assembly was easy enough once we got all the components out of the box (they were housed in very tightly) to ensure they were not damaged or lost in transit no doubt. The scan or QR coded instruction manual, maintenance and registration was outlined on a hard to miss bright yellow card. I only registered the appliance to use the phone controls a few days prior to completing this review and found it very easy.

An analysis of our electricity bills (which I’m able to do online with my current provider), gave me a daily cost breakdown, allowing me to consider the running cost of the Dyson product. We started using it in winter (this year a bit colder than last). I must admit we’ve been heavy users of the Dyson heater/cooler + purifier, much more than we would normally have used the split air or the other small electric fan heater (which had we been using would probably have had the same or greater cost impact on our bill). Each households’ tariffs differ depending on provider, daily usage charges and consumption plus other factors such as if you have solar to reduce the costs. Our provider has us on a plan offering negligible savings for our solar off-set so we intend to change. Having said this, the increase to our bill was outweighed by the convenience of having the heat where & when we wanted immediately. We expect running costs will improve as the days get longer and the solar becomes more cost effective, it probably cost us equivalent to a small cup of bought coffee a day, I guess the cooling function in the summer may not cost as much either, yes, I tried out the cool air function but it’s hard to assess how good it is when the heating function is what you really want to use this time of year, I think it will work at least as good as any other fan.

Not being an early adapter to technology I was surprised I could do it all without my husband needing to ‘Help me out’. I downloaded the app onto my phone after reading/watching a video on the Dyson website, it all came together relatively easily in around 15 minutes with a few hurdles sorting out the connectivity to my phone, I had a few failed attempts. NOTE: prepare by having Wi-Fi password at hand & both blue tooth and Wi-Fi setting on your mobile turned on (taking my phone cover off also helped connection to the device), holding it exactly in the position shown on the diagram (hovering over the on/off slightly tilted). After I connected my phone app, all sorts of exciting options opened to me: - timer, night mode, airflow direction & oscillation apart from the basic expectations of on/off, cooling, heating, fan speed and auto plus the amazing Air Quality Index, which shows both the air quality outdoors where you live and offers comparison to that of the inside your home. One thing that confuses me. While setting it up, it asks what room you’re in (this is so the device can evaluate that nominated rooms AQI). I have not yet worked out how to nominate another/other rooms when I take it around the house or swap it to another house and I wonder if I’ve missed something that allows me to do this, or perhaps is it supposed to stay in only one space?

The information that the device gives me is that our air quality in the bedroom today is good, 0.000-0.099 HCHO scale (which is the formaldehyde levels), meaning that the machine is detecting a very low level of microscopic particles and VOCs. In fact, there are readings available to show relative humidity (RH), Particulate matter (PM2.5) which detects smoke, industrial emissions and candles, (PM10) which include pollens and other allergens, (VOCs) including cooking, burning fuel, perfume and cleaning products, (NO2), cooking gas and vehicle emissions as well, these were all the same ‘good level’ in the bedroom, the lounge room and the family room. I tested to see if these readings would change when I lit a candle and sprayed some spray deodorant nearby the Dyson (within a few feet). This resulted in the AQI display for ‘Now’ showing within around 15 minutes I noticed a big increase in both the PM2.3 reading (went up to 21) and the PM 10 reading (reached up to 29). Leaving it and rechecking readings around 15 minutes later I saw these readings drop down again to readings of less than half what they’d been (they reduced to PM2.3 reading 9, PM 10 reading back down to 11). This was conclusive to me that it detects these fluctuations, further what we’re doing in our homes needs to be reconsidered in respect to those lovely candles I like to burn and the chemical sprays we use to clean our home or spray under our arms each day.

I had one small technical issue when a triangular yellow icon alert showed up on my phone app saying the oscillation function could not work as something was in the way. It was telling me to remove it and then I could then switch it back on. After turning the unit off and back on again (nothing was blocking the unit from oscillating and I didn't know how to tell it that ), it remained still, both the phone app and the unit itself would not turn it on. I went through the troubleshooting hints on the Dyson website where I was still unable to find a fix for this problem alone, so rang the customer service help line. It appears any dust that should accumulate on or around the four sensor slits on the machine can stop operation of the oscillation function. It was remedied by not just turning it off again but unplugging at the wall, dusting off the tiniest amount of dust coatings then turning it back on. Once this was done it prompted me with the various options of oscillation degrees, as the customer service lady had kindly walked me through the process it was simple enough to fix but I would never had thought such a miniscule amount of dust could have caused this to happen.

We’ve heard about the many nasty carcinogens floating around in the air (many man-made) like asbestos, Vinyl chloride, lead paint, coal emissions, wood dust and formaldehyde, there are even food carcinogens. Wouldn’t it be wonderful if we could reduce these from our air intake as we heat/cool our home (Googling shows there are a few brands on the market that make claims to be medical grade purifiers, but I haven’t seen anything like the Dyson that has this as one of three functions for use within the home), isn’t it worth the cost of a coffee a day?

Whilst not relying solely on this device to save us, if it could help slow the bioaccumulation of the amounts of these toxins that can cause us to become sick and even cancer prone, a good plan to protect our families. I agree with some other reviews that heating/cooling effectiveness could be impaired by large expanses of glass windows without adequate window furnishings, however this would be the case with any form of heating/cooling surely? We need to seal our homes ourselves in order to make a difference and make it possible to maintain a good temperature.

This appliance is certainly not going to appeal to everyone at a purchase cost of $999, it’s not cheap, however remember it offers three appliances in one, that’s what makes it a standout. Other features include space saving as a 3-in-1 appliance, very transportable, gives us greater control of our environment, looks great and is made by a company with a great reputation for innovation and reliability.

Conclusion: Both my husband and I are impressed with the Dyson appliance. We will continue to learn more about it and use it in preference to our split air-conditioning unit as it improves air quality which is a significant benefit, it makes us feel good (not sneezing so much since using it) and we can share that with our family and friends too.

I connected the app later in the review period as I wanted to get familiar with the how the basic device worked without too many distractions. Using the Dyson unit with the remote is very easy, as is understanding the display on the machine itself even though I’ve now got the phone app, like many mature aged people I don’t always carry my phone with me everywhere and will probably use it more with the remote than with the phone and just check the AQI from time to time. We don't have any google nest or smart home type devices to turn things on won't be hooking up to anything else but I tried it out and I can turn the device on and off from the garden, that's good to know on a cold day. Elderly people may find the Dyson 3-in-1 difficult to move around, as there are no castors, although not heavy for able bodied people anyone with less mobility may find it a touch difficult and many would not use the phone App. In my opinion. I wish it could be cordless but probably not possible, I’d personally like to see it available with a longer or retractable electric cord as I have to find an outlet very close by or use an extension as the electric lead is around 1800 (6’), which in a large room isn’t a lot but other than that it’s brilliant.

It's a thumbs up from us. Thank you for the opportunity to test and review this product we absolutely love it!

Very handy purifying heater – TLDR: Very nice looking machine. Heating function has been super useful. Air purifying feature seems good, but you're basically just trusting the numbers the machine shows you unless you have some kind of 3rd party air quality tester. Fan is loud on max settings, price is very high. Appearance & Build Quality Right off the bat, this purifier has… Read more

a very sleek appearance like you'd expect from Dyson. Super classy and modern-looking appliance that I think would fit in understatedly in any living room or bedroom. The unit was easy to put together and feels sturdy. Most of the weight is in the bottom half of the machine and it has a wide base so it can take a bit of a bump without tipping over. The only thing I found odd regarding the build is that the manual says not to pick up the machine using the loop, but there isn't really any other obvious place to pick it up apart from squatting or bending down to pick up the whole unit with two hands.

Air Purification

Now, I would sum up the marketing for this product as "The air around you is poison and you never knew - lucky we can sell you something to fix it", which was a bit over the top for me, but I guess that's advertising. I don't have any sort of independent air monitoring technology so I was essentially just relying on the purifier's own numbers being accurate. I can say for sure that it reads the air quality as being bad when I would expect it to, and gradually declines as it filters out the nasties. I tried a few different ways to mess up the air such as soldering something indoors, burning something in the kitchen, and letting a bunch of air in from outside (we live near a relatively busy road). In each of these instances the machine reacted very quickly and was able to bring the air quality back to an acceptable level within half an hour in the worst case, which I think is pretty quick.

Heating & Cooling

I think this is a great strength of this unit. It's currently winter and the heating + fan function is fantastic. The fan gets very loud on max setting (10 fan speeds available), but I have found that it can heat up our small living room pretty quickly on setting 3 which is not too loud. There is an option to reverse the air flow and shoot the air out the back. I couldn't really find a use case for this where I would prefer to just rotate the machine around, and usually I set it up facing the direction I want to begin with. The two sides also aren't symmetrical, so the reverse function shoots air out in a wider arc with a bigger "dead zone" directly in front (or rather, directly behind) the fan loop.

Controls & App

I have found the remote control to be more than adequate for regular daily use. The app gives you very fine control over things like the direction of oscillation and detailed air quality feedback. The only drawback I found with the app is that the unit can only be linked to one person's app at a time.

Cost

As usual with Dyson products it's super hard to justify their huge price tags. This is a very nice machine and some people may like the prestige the brand is associated with. However I think for the majority of Australians this type of high-end product is not a realistic consideration, especially when you have nice-looking offerings from Breville or Xiaomi for half or even a third of the price. I am very grateful to have this machine, but the price tag of this machine is a big enough con that for many people completely overrides the many pros this machine boasts. I removed one star from my overall rating for this reason.

A premium purifier that is stylish with quick and efficient heating – Opening up the box, it is great to see that Dyson uses only cardboard to protect the purifier but there is still a plastic that encases the purifier. It would be great if the plastic could be reduced so that its better for the environment. The HEPA and carbon filters were very easy to install without having to read the manuals, plus the… Read more

instructions were very clear on the sticker on the front of the purifier. Remember to peel it off before you use it ;-)

Build Although the purifier is made of plastic, it feels solid and is light enough to move it around. We had initially wanted to use it in our living room but then moved it between our rooms so the lightness made it easy to take it up and down the stairs. Some may feel that for such a premium price, it should be made from materials like steel, I feel that the Dyson build quality is really good. We also have a Dyson handstick vacuum for more than 4 years and the only “repair” required was a new battery.

Design The use of the gold makes the purifier look and feel more premium, even though the cover is made of plastic. The remote is also the same colour of the filter cover and it cleverly sticks on the top of the fan so you don’t misplace it. Dyson’s air multiplier circulates the purified warm air around the room very quick and a plus it is very quiet (as we rarely use it above the level 3 fan). However, it can be quite loud at high fan levels above level 7 but for our use, we felt it was quiet enough.

Usage The newest technology of the “Formaldehyde” purifier is the ability of the sensors to detect and clean the harmful substances if it is in the room. During our use, the HCHO reading has been good but when we were cooking, I did notice the NO2 scale did rise and when the purifier was in the living room, it automatically increased the fan to clean the air and get rid of the smell. We mainly use it on the “Auto mode” and the app gives us a reading on the app, which I’ll explain in the next section. We haven’t used the cool setting but a thing to note, it is not an air conditioner so the “cooling” function is really to circulate the air using the multiplier technology. It does however warm up our bedroom that is about 12m2 in about 5 minutes, set to 20 degrees and fan level 3. It’s so quiet we’ve set up the purifier to come on in the mornings to warm up our room, plus it is quiet enough. The air does feel fresher and cleaner as we have noticed we sneeze less.

App The app’s UX has been considered as it provides the main controls and information on the screen. When you swipe from the roof of the house, it provides more about the various air quality data it has captured from its sensors. Tapping on any of the numbers, it brings up a page that explains the icons and reading data so you know how clean is the air in your room. I love how easy it is to set up different timers for the purifier to come on at different times and the voice integration with Google has made it so easy to turn it on whenever we want, if our phones are out of reach.

Is it worth it? The price of the Dyson Purifier Hot+Cold Formaldehyde at $999 is rather expensive for a purifier but the app, usability and functions do somewhat justify the premium pricing where it heats up our room fairly quickly and we are able to have a good night’s sleep. My advice - shop around for a deal.

Update 18/11/2022 The purifier developed a fault and after contacting the wonderful Dyson Customer Support, I was advised to send it into their service centre. After 2 days, I received a notification a replacement will be sent and when I received it, it was a "brand new" purifier. Great service and warranty support!

Fantastic fan/fan heater with a HEPA filter. I wouldn't really class it as an air purifier – If I were reviewing this as a 'Dyson Fan Heater with HEPA filter' then I would be giving it 4.5 stars out of 5. It is a really great fan/fan heater but I have to review it as what it is advertised as and that is an air purifier and as such it is only okay! (It is kind of like calling the {awesome} Dyson Vacuum cleaner a Dyson Duster!!! Why?). … Read more ·  1

There are a good number of reasons to buy this including: ===================================== - It is a fantastic/premium quality fan and fan heater. - If you own any Apple products or any other Dyson products then this is probably for you. - If you want a premium heating solution or fan for a small area in a home or business. - Having used this I feel ALL fans and fan heaters should be fitted with a HEPA filter! - It would look fantastic in any modern house or for any business and definitely convey a good impression. - The level of remote control from the app is great and well worth the premium. - Despite internal sensor readings it did seem to reduce amount of dust and pollen in the room. - It was very quick and easy to get up and running. - The app is really easy to use and responsive - It is really quiet as these things go. Even on maximum fan. - No visible moving parts. (Except when it is rotating) - Night mode!

Room for improvement: =============== - The sensors/monitoring isn't that great. Sadly it seems to be more of a gimmick. I was unable to test it scientifically, however, to give an example placing it in a fully steamed up bathroom the Humidity sensor read a maximum 70% humidity whereas at time other times it read the same humidity (and higher) in my bedroom! Also the sensors didn't really seem to detect dust (even when you could see the dust in the air!). - According to the internal sensors running on full blast or auto didn't seem to make a huge difference to the speed at which the various pollutants dropped. Note: despite what the sensors said it did feel like there was less dust in the room based solely on my allergies (and sensitivity to dust). - I did not notice much of a reduction in odours. - No child lock! Why is there no child lock? It would have been so easy to implement either in the app or on the remote. Please put some means of disabling local control on the unit. - Connection to the web/app drops out a lot unless it is sat within 10ft of my wifi router.

Extreme-Quality Heater/Fan/Purifier at a Premium Price – worth it if you need it – It’s 5 stars only if you need all of its features - you’re concerned about style, heating and cooling your room, ease-of-use and removing dust and allergens (and formaldehyde) from your home effectively, this is the machine for you. It’s a premium product at a premium price. Otherwise, go for something that will be better value for you. The… Read more

biggest selling point for Dyson for this purifier is its ability to detect and remove formaldehyde in the air in your home. Now, I had to look up what it was – I didn’t know. They may need educate the general population more for this purifier to sell better, given its price-tag compared to some of their other purifiers (which have less features). If you don’t care for the formaldehyde aspect, get the Purifier Hot+Cool for a cheaper price. Very simple to set-up – you connect the filters in, stand it up, turn it on, install the app if you want, and you’re on your way! Circulates airs around the whole room - It really does push the air around the whole room. For example, if I have a light candle nearby the fan, in one corner around the living room, I can smell it even upstairs which is quite a bit around the corner and up the stairs. The app is awesome – very responsive, and has worked well every time I’ve used it. Not need for the remote control to be honest because the app is easier to use The fan is so versatile – it can blow air forwards, backwards, rotate almost 360 degrees Up to 10 fan speeds, and temperate control is specific – and all this is easily done digitally through the app Quick to heat (and cool, I assume) the area (and room if it’s not too big) LCD display is very handy and looks good Warranty – As with all Dyson products, warranty will be top notch (not that I’ve had a problem with it at all so far). Take it in to their customer service centre, and they’ll work it out from there with you. Not sure about the purification aspect - It seems like my house is always in the green (when I do glance at the LCD once in a while). When I spray some deodorant near-by, the colours on the app and machine do change and it picks up there’s something in the air, and I’m guessing, will get rid of it! We’ll have to trust Dyson on this, and I do, given all the extensive lab testing, and quality control they have on their products. Both Quiet and Loud - It’s quiet on the lower settings, but once you push it past 3-4 fan speed, I do find it quite loud though, especially on the higher fan settings. It’s not unbearable or anything like that, but it’s noticeable. that I guess that’s the price paid for the amount of air Dyson has going through the small openings and having no blades. Having a little one that crawls around the ground, I do need to put in at a height, because I’m afraid the little one may get to it and potentially damage the bottom bit of the purifier. All-in-all, it's really an awesome piece of equipment that heats and cools and purifies in such a fancy nice way. It's easy to use, got a great app, and effectively circulates air around even larger rooms. But, it's only worth it if you need all of functions - if so, it will be fantastic for you. If not, you're probably better off looking at other alternatives which doesn't carry the premium price tag.

Excellent if air quality or dust is an issue for you – Firstly I was provided the Dyson and asked to write a review- It is not something I would have purchased as it is an expensive appliance. However, after living with it for a month I would certainly suggest people with allergies or sensitivities consider it (even if you just want less dust). If the unit was cheaper it would have got 5 stars. The… Read more

unit arrived well packed with recyclable packaging (no polystyrene). The instructions were clear and the unit assembled easily. It "clicks" together solidly and feels very well built. The app was easy to load on my phone and provides a HUGE amount of information and control. It does work with google home but I had to look online to find out how (instructions mention Alexa but not google?)

The unit functions very well and I left it on auto for the month I have had it. I do switch it to "night mode" when trying to sleep. The fan is not overly loud and projects air a long way easily. The heat function is capable of heating a room and the fact you can turn this on via the app before getting home is handy.

It detects minute amounts of chemicals and debris in the air and the fan speeds up to clear the pollutants, and the graph on the app clearly shows what's happening and when. It really makes you aware of the pollutants we are releasing into the air. There is so much information available if you want it- or just check the basic room air quality.

I thoroughly dusted and vacuumed before starting the trial and have noticed much less dust (I have a gloss black glass table top which is a huge dust magnet).

I previously have noticed waking with a slight nasal blockage since moving into my new house (4 months)- I feel since using the Dyson that this is much better of a morning.

The app has a filter monitor, and tells you when you need to replace the filters (about $100). After about a month I have used 5% of the filters capacity. (The filter pictured is after near a month of use)

Bottom line- If you have allergies or air quality issues certainly consider it. If you are planning to buy a Dyson fan (only) certainly consider the few extra dollars to gain the extra functions, pollutant filtration and heating. Yes- I will be buying filters, when needed, and will continue to use the unit.

Great for Asthma Sufferers – Unboxing – comes with filters uninstalled (2x replaceable HEPA 13 particle/ carbon filter and 2 x lifetime catalyst filters.) There are front and rear filter covers which are released by pressing on tabs. The filters easily clip into place- one particle filter into each removed cover and the catalyst (metal) filters onto the actual purifier.… Read more

There’s a diagram (sticker) on the purifier which gives a basic picture of how to install them.

There is no detailed instructions booklet supplied. That can be accessed by the Dyson Link phone app or on their website. See here https://www.dyson.com.au/products/air-treatment/purifiers/dyson-purifier-hot-cool-formaldehyde/owners-guide? You do get a short pamphlet showing the filter installation, remote control operation, how to turn it on, how to connect it to the Dyson Link app and tips on the best place to locate the purifier. The full operation manual can be accessed on the Dyson Link app or Dyson’s website.

There is only a power button and small colour display on the front of the purifier. The supplied infrared remote control, phone app or voice controls (via Amazon’s Alexa / Google Home) must be used to operate the various settings and modes. To control the purifier (via your phone) you need to initially connect to it to your phone’s Bluetooth using the Dyson Link app. That app then sets up the purifier to operate via your home WiFi. People who aren’t tech savvy can simply use the supplied remote control to operate it combined with using the screen on the purifier’s base.

The phone app is definitely my “goto” for controlling it. It’s well sorted and provides a vast array of air quality data – for both inside your house and also for your set suburb (this appears to be data from government monitoring stations.)

Data logged via graphs for inside your house: - Temperature - Humidity - PM2.5 (Particles measuring up to 2.5 microns in size e.g. smoke, bacteria, allergens etc.) - PM10 (Particles measuring up to 10 microns in size e.g. dust, mould, pollen etc.) - VOC (Volatile Organic Compounds. Odours that can be found in cleaning products, paints, new furnishing etc.) - NO2 (Nitrous Dioxide. Gases generated by combustion e.g. gas cooking, vehicle emissions etc.) - HCHO (Formaldehyde level. Can be released long term from furnishings, floorings, glues etc.)

The data for inside your house is graphically stored via the day and time of day. Only one week’s history is kept.

Air Quality data is displayed for your suburb (possibly not available for all locations): - Temperature - Humidity - Air Quality Index - PM2.5 - PM10 - NO2

The data you can obtain is very comprehensive. Having gas appliances (cook top and older heater) logging of the CO (Carbon Monoxide) levels would have been a nice inclusion. The same would apply for anyone with wood fired heating.

Operation- You can either set the fan to a manual speed on the Cool setting or leave the purifier in Auto fan mode to operate in the air purifying mode. In Auto mode the fan speed is determined via the levels measured of the previous listed chemicals and particles. The inside Air Quality graph has a continuous line which shows the measured overall inside Air Quality via four zones (green, yellow, orange and red) to indicate the inside air quality. In “Auto” mode a grey “Auto Target” line determines the automatic fan speed. If the Air Quality deteriorates (the measured Air Quality rises above the “Auto Target” line) then the fan speed will automatically rise to increase the volume of air being purified. When the Air Quality deteriorates scrolling through the particle/ chemical pollutant graphs will show which levels are rising and have caused the Air Quality level deterioration. The background colour of the app will also change to visually highlight the measured Air Quality.

I found activities like cooking (using the gas cooktop and oven) would cause a sharp rise in VOC levels and a smaller rise in NO2. Left in AUTO the purifier’s fan speed increases automatically to reduce the levels. The impressive part was the purifier was located in the living are- not close to the kitchen- but still picked up the poor air quality and increased filtration until the levels dropped. The VOC spikes high with any food cooking related odours. Well cooked (slightly burnt) food would also spike the Particle sensor reading higher.

Via the phone app you can pull up an image of the remote control and change settings the same as using the actual remote- but without the limitations of an infrared remote (direct line of site to the purifier.) The app controlling the purifier via WiFi means you can change purifier mode and other settings anywhere your phone has mobile reception. If you use Amazon’s Alexa/ Google Home voice control app the purifier can also be controlled via voice commands – you need to enable the Dyson Skills app and have an Amazon Alexa device or the app on your phone to do so; or Google Home set up. I experimented with Alexa on my phone and found it a bit “clunky”, however that was due to me using the wrong phrases to try and change settings. Familiarity via experimentation would certainly improve the experience.

There is a built in heating function, simply enable Heating mode and set your desired temperature in degrees Celsius. The fan switches to Auto and will vary speed to achieve the desired room temperature. The heating element varies the heat and fan output until the desired temperature is reached. The heating is very effective but it wouldn't be the most economical way to heat large spaces. I measured 2400W being drawn while it was bringing the room up to temperature on the highest fan speed. (Noting that level of power consumption would be much the same as any other powerful portable electric fan heater.) I also found the hot air temperature blown during heating was somewhat tempered by the “air multiplier” effect, so didn’t feel the warmest if it was blowing directly on me. The surface of the air head around the area where the heated air is blown out got too hot to touch (something to be aware of with young children.)

The app can be used to set up multiple time schedules with whatever mode/ features you desire set. There’s a “Night Mode” which dims the purifier’s screen and reduces the fan’s speed, you can change the air flow direction so it is diffused out the side of the air head instead of directly ahead-handy on a cold day if you just want the house air purified and don’t want cold air blown on you. You can also change the air head direction and set up various oscillation modes via the remote/ app. The purifier can also be manually tilted at the base to change the air direction vertically up or down.

As far as power consumption goes, it is very economical in cool mode and AUTO fan speed (i.e. the setting you would most likely use for purifying air in your house.) I measured only 2.6W when the Air Quality Level was tracking close to the Auto Target mode and it was automatically “idling” on a low fan speed. Fan speeds 1 to 4 all measured less than 5 Watts consumption - which is very economical. That level of power consumption is so low you’d struggle to notice the difference on your power bill. Even the maximum speed of 10 was only consuming 24 Watts. At the higher fan speeds the noise levels do noticeably increase. Low fan speeds are barely audible.

If you suffer from severe Asthma this would certainly be a desirable appliance to have in your house. My wife has mild Asthma and didn’t have any flare ups while testing. (We’ve got a dog and a lot of carpeted floors in the house.) From the logged data it was clear the purifier was reducing airborne particles inside the house, automatically increasing the fan speed as required. Formaldehyde levels could also be seen to drop with it operating.

The only negative point when purchasing is to be aware that the two HEPA 13 particle filters will need to be replaced. (The formaldehyde catalyst filter never needs replacing.) I haven’t been testing the purifier for long enough to gauge the filter life, however the purifier gives a percentage readout on the HEPA 13 filter’s “life left”. After 3 weeks continual usage it is sitting at 92% life left. (Dyson’s website currently lists the filters as costing $99.00 for the two. The part number is 965432-01 )

I did experience some WiFi connections issues when using a Bluetooth Audio Transmitter with 1m of the purifier. WiFi would drop out rendering the phone app useless and the IR remote control would then be the only option to change settings. (A Smart TV streaming box located within 20cm of the same Bluetooth Audio Transmitter works on WiFi.) I also experienced some glitches with the Dyson Link app scheduling- where it would stay in night mode when programmed to switch off.

I did notice while testing that the Dyson Link app had changes made, so Dyson appear to be continually updating it e.g. the graphs have had a higher purple level added giving five levels on the measured air quality graphs.

The attached video shows the info that can be displayed on the Purifier's built in colour screen.

(I was supplied the Dyson Purifier as a ProductReview Ambassador, to publish an unbiased review.)

I want one for every room!!!! – I am in love with the Dyson Purifier hot + cool. Honestly didn't think it would be as good as it is. Love that you can rotate it upto 310 degrees and that you can tilt it so that the air goes more towards your face. The colour matches my personal style. And it takes up no room. Running it on high speed it's a little loud but still not any louder… Read more

then a standard pedal stool fan on its second speed. I love using the app and seeing what's going on with the air quality. At first it was green all day and I thought oh so it is a waste, however I was doing my nails about 10 meters from the Dyson and it spiked into the red when the acetone was being used. Also when the deep fryer came on, it was at the highest it could go. So we are going to buy a air fryer to see if that helps. My downside is the cost. It's not cheap at all. However having a child with asthma I would recommend this to anyone. I would love one in every room.

Great heater and air purifier – I’ve been using my Dyson Purifier Hot and Cold formaldehyde for 2 weeks now and I’m very impressed. Straight out of the box, this air purifier has the signature Dyson look and feel about it. I can’t really explain it but in a word, it just feels like quality to the touch and l think it would look nice in any home. Getting the air purifier… Read more

unpacked and assembled was easy, only needing to install the filters and covers. There are some very basic and easy to understand instructions included in the box. The instructions didn’t go in to too much detail about air purification, particles and formaldehyde etc. I was a little disappointed at first about the minimal information but once I connected to the app, I found that the app gives simple and clear information to explain the air quality and what it is measuring.

The app was very easy to set up. I have many smart devices in my home and this was by far one of the easiest to get connected. I could then link the Dyson service to my google assistant and control the air purifier through google assistant.

You can control the temperature, fan speed and oscillation of the purifier using the remote and also the app which is nice. You can set it at 45, 90, 180 and 350 degrees which is great for giving you choice in where to place the unit. You can use it with heat, cool air or on

I like that the remote control attaches to the top of the unit via magnets so I should not lose it.

It’s winter at the moment so I’ve been using the unit to heat my home office whilst working from home. It’s allowed me to turn off my very expensive to run ducted gas heater during the day. It’s a 15m2 room with an open doorway. As the unit can be noisy with the fan speed on higher settings, I leave at speed 1 and it does a great job at keeping the room warm.

Being winter, we’ve also been using the unit to help dry washing hanging on a clothes dryer inside. It has sped up the drying process and the clothes no longer have a musty smell.

The air purification function does not seem instantly obvious but my family has noticed that we no longer have food smells lingering through the house if the air purifier has been running. We haven’t had the air purifier in the kitchen but is still seems to remove odours whilst running in a nearby room.

Another benefit I’ve noticed is improved breathing by running the unit in my bedroom each night before going to bed. I have sinus issues which I’m now sure has been because of dust etc in the atmosphere. I am no longer waking up with my nose blocked every morning. I’ve also noticed that the bedroom furniture is not covered in dust after only a few days.

I haven’t had the chance to use the cooling component but as it is a fan only, I’m not expecting too much.

Overall, I’m very happy the air purifier. It’s a portable and versatile product that my family has many uses for.

Quietly efficient – The Dyson HP09 is a stylish addition to our home heating equipment, quietly working away in the corner keeping us warm and cozy without the noisy rattle of traditional fan heaters. Even on max speed it is hardly noticeable in the corner of the room and easily heats our 40sqm kitchen/living room area. Unpacking and assembling the HP09 was a simple… Read more

process and it was truly a joy to see hardly any plastic used for packing materials. There was no environmentally unfriendly annoying polystyrene to fill up our rubbish bin. A “Quick start” instruction sheet is supplied in the box, but there is also a handy QR code link to a video of the setup process and product registration website. (The vid also shows how to tilt the fan and store the remote on top of the fan.) The HEPA filters and shrouds easily clicked into position and it is then just a matter of plugging it in and pressing “go”. The tiny (shock resistant… yes I dropped it) remote control does the job, but I had much more fun using the easily configured App. Like most people these days, my phone is always with me, so lazy old me doesn’t even need to get up off the couch to find the remote control. (I had a super-nerd moment one morning when I turned on the heater from the comfort of my bed while my partner was making a cuppa in the cold kitchen. To her (pleasant) surprise I was even able to point it in her direction, turn up the heat and adjust the fan to max :-) ) Another great feature is that the fan can oscillate 45, 90, 180 or 350 degrees. This was really useful during the recent lockdown when we didn’t want to use the reverse cycle AC to heat the whole house. We were working in two adjacent offices, so I placed the fan in the hallway and set the fan to oscillate 90 degrees so it warmed both rooms at the same time. While I haven’t used the cooling fan during winter, I’m sure it will be able to provide a pleasant breeze when necessary. One of the selling points of the HP09 is that it monitors the air quality and airborne particulates in the room. In “auto” mode it will even turn itself on when conditions drop below recommended levels. Apparently, the filters extract particles smaller than 10 microns, (e.g. pollen. NB fungal spores range from ~0.3µm to ~4µm.) and it claims the catalytic filter will remove volatile organic compounds (VOC) such as formaldehyde, commonly found in home furnishings. Individual air quality values can be viewed on the unit’s colour display screen by using the “i” button on the remote, but only basic VOC, Temp, RH and overall room air quality can be seen on the App. In the App the “Your Machine Settings/Air” provides info on filter life and is also where you turn on continuous monitoring. Another techno-geek option in the App is the ability to setup personalised voice controls. My partner got a chuckle out of that. “Hey Siri… Dyson oscillate” LOL.

Overall, we are very pleased with the HP09 heating/cooling fan. It easily heats our medium sized open-plan living area while removing pollen, dust and volatile chemical compounds. The easily configured Wifi App is a “must have” and contains useful environmental info, an instruction manual and all the user settings. One of the fun features is the ability to control it from remote locations, inside or outside of the home.

Has Dyson done it again? Unfortunately not! – I got the ‘Dyson Purifier Hot+Cool Formaldehyde’ air purifier/heater/cooling device for free to test. Anyone who has read my reviews will notice that if it’s good, I’ll say so. If it’s not good, I’ll be just as straight with you. When I was offered to review the Dyson, my first thought was “I could have used the air purifier during the recent… Read more

bush fire season”. But like my dad used to say: “Better late than never!”

I already have the Dyson Outsize vacuum cleaner which is fantastic. I use it daily. With two fluffy cats, it's a must-have! It works really well and has never failed. I was expecting similar engineering magic with this device, especially since it costs $999.

Anyone who was around in the 1970’s would have heard about formaldehyde. Formaldehyde was a chemical widely used in particle board, glue and many other products. Formaldehyde has been proven to cause headaches, nausea, skin irritation and, in the worst case, cancer. Dyson has created an air purifier that not only removes dust and allergens but also ‘destroys formaldehyde’ if present in the air. This is great news as furniture often releases formaldehyde years after it’s been made. Although formaldehyde is banned in particle wood (at least in Europe), some countries still use it. So, this feature will be of great use to those who want allergens and toxins removed from the air.

So, let’s go through the unit step by step. It’s an air purifier/heater/cooling device. The unit captures 99.95% of particles as small as 0.1 microns, it meets HEPA H13 standard, destroys formaldehyde, it can rotate, it has a remote control, can be connected to your phone via Wi-Fi and it reports on air quality in your room on an app that you can download (it has a screen on the unit as well but I’ll get to that later). Apparently, it can purify the air in a room of up to 81m3 and heat a room of 35m3. The list of things that this device can do is outstanding. Did I say, the price is $999. Replacement filters cost $99.

As with all my reviews, I look at quality, does it do what it’s supposed to do and is it affordable?

The device came packaged in primarily cardboard which can be recycled. In this day and age, most people expect recyclable packaging. Thanks, Dyson, for thinking of the environment.

The unit was easy to put together. The filters were packed separately and it was intuitive to snap it all together. The remote is also intuitive to use. Nothing special here. The impressive thing here is the Dyson app. You can control the device via your phone and get air-quality readings and get a feel for the types of particles in your air. Great for those who have allergies. You can monitor air quality over time to find out at what time the air quality is best or worst and activate the filter. According to the app, my air-quality is excellent. However, I have an issue with volatile organic compounds (VOCs) between 4:00 pm and 8:00 pm every day. I have no idea why. The Dyson app was easy to download, easy to connect to the unit and to operate. I’ve dealt with quite a few apps over the years that are supposed to connect to a heater, fridge or whatever. They were all bad. But seriously, this app just works! It’s easy to use. No hassles with signal dropping out, poor connectivity etc. It works!

The device pumps out some serious heat. It rotates silently and you won’t hear any noise. But this is unfortunately where the fun stops. Although my small 18m2 office turned into a sauna after just a few minutes, when testing the device in my 30m3 bedroom, it warmed up the area around my bed but not further than 2m away. In fact, the temperature on the other side of the room was quite cold. Perhaps Mr Dyson thought that every house in Australia has double glazed windows? Well, Australia doesn’t and I seriously doubt that this unit can evenly heat up a typical Australian room of 35m3 unless you turn up the fan which is very loud even at lower settings. My existing reverse-cycle air con usually heats my bedroom at night time. To my surprise, the Dyson is significantly louder. You have the constant jet-stream type noise, even on setting 1. Whether you have the fan speed on ‘auto’ or the lowest manual setting, the fan revs up, slows down, revs up etc. I couldn’t work with the constant noise when I had the Dyson in my office let alone sleep when it was in my bedroom. So, I turned the Dyson off and turned my electric panel heater on which is silent compared to the Dyson.

When I lay on my right side in bed, I had hot air blow in my face. That’s because the height of the Dyson is the same height as my face when lying down. When I lay on my left, my face was cold but my back was hot. Changing the airflow direction turns off the heater and ‘cold’ air blows. Had I increased the airflow speed, the room may have heated better, and I’m sure that would have helped, but the ‘drone’ noise would have been even worse. I tried it. To prove the point that this was the loudest heater/fan ever, I turned on the Dyson together with my old built-in reverse-cycle heater. Once I turned the Dyson on, the fan/wind noise easily drowned out the sound of my old reverse-cycle unit, and mind you, the Dyson fan was only set to ‘1’. My reverse-cycle system was set on medium. A YouTuber who tested the same device called the Dyson a “drone taking off”. Folks, for one thousand bucks, I was expecting whisper-quiet operation.

The ‘cool’ function felt cool because it’s winter right now and I was merely blowing already cold air into my face. It will not cool the room any more than a conventional fan would… and it makes more noise! There is an interesting YouTube review where a guy tested windspeed and noise of the same Dyson unit with a dB meter and compared it to a conventional Walmart propeller fan. The Dyson was 10 times louder at less wind speed! The word ‘cooling’ is a tad misleading because it’s a fan, not an air-con. It doesn’t ‘cool’. It blows the air around like a conventional fan. Cooling occurs when wind hits a sweaty person. When the sweat evaporates, it causes a cooling effect. Any conventional fan can do that.

I can’t honestly say much about the air-purifying function as I don’t have a lab to test it in. I’ll take Dyson’s word for it that it works. Other reviewers that did test removal of odours by lighting candles etc claimed that it worked. I believe them. However, I’m not convinced that the Cryptomic formaldehyde filter is useful. While formaldehyde is a health risk for some, in low doses, it’s generally not dangerous. If you’re worried about formaldehyde, wash those new curtains before hanging them, don’t buy carpets – install a wooden floor and check the origins of your furniture. Some countries apparently still use formaldehyde in glue. Finally, I read somewhere that Dyson’s method of breaking down formaldehyde creates ozone. But since I’m not a chemist, I wouldn’t know. Ozone is said to cause irritation and inflammation of eyes, nose, throat and lower airways: coughing, sore and scratchy throat or uncomfortable feeling in chest.

The display is difficult to read unless you’re right in front of the unit. I guess you can use the phone app to control the device (and the app works delightfully well) but the display’s design is not good. It is too small and too dim. What I would have liked is connectivity to Google Home or a similar home automation software. Getting back to my initial review criteria of quality, does it do what it’s supposed to do and is it affordable, I can state the following: yes, the build quality is good. Does it do what it’s supposed to do? Yes and no – although I’m tending more towards a ‘no’ on this occasion. It heats but the bladeless fan is too noisy and does not produce enough wind force when used as a “cooling device” and it’s too loud. The Cryptomic technology has thrown up a range of questions regarding the potential of destroying formaldehyde but replacing it with ozone; and then the price….really? If you bought a heater, a fan and air purifier separately, that might cost you $300. OK, so we have the formaldehyde busting technology. But does this warrant the price tag?

The concept is great: heating, ventilator and air-purifier all-in-one. The app is great and the unit looks cool. If it weren’t for the noise, I’d give it 4 stars. But because of the high price, it only gets 3 stars.

Overall, this is an expensive investment. I considered how I’d use it around the house but found no use for it and eventually gave it to my ex-wife as a parting gift. I can’t use it in my music studio, office or bedroom as the fan is too loud. I really wanted to find a place for it but it is a device for the upper class who’d probably have climate control in every room of their homes anyway. I can’t imagine a guy in the Bronx or someone in a rented apartment in Sydney or Cobar buying this.

Effective and comfortable heating; questionable utility of air quality / filtering features – I've been using the Dyson Purifier over the last few weeks in a house a stone's throw from a major arterial road. I was expecting it to report all kinds of air quality problems, but the Purifier reports we have great air quality. Regardless of purifying it makes a great heater. As a fan heater it works better than any I've used before - it… Read more

spreads warm air around a largish (~24 m2) room quite well, without being too hot for people closest to the heater and too cold for those further away. It consumes about 1.8kW of electrical power, so it's not some magical unicorn and this heating effectiveness comes at the cost of energy consumption. It's a little quieter than many traditional style fan heaters but by no means "whisper quiet". There's a night mode that's supposed to be quieter but doesn't seem to do much when I activate it.

There's a little display on the base of the unit, it's angled up slightly so you don't need to crouch down to read it. The only function you can control from the device itself is "on" and "off" - for anything else, you have to use either the small remote control or the app. The remote is powered by a coin cell and to Dyson's great credit the battery is secured with a child-safe screw (coin cells can kill a child if swallowed).

The app works well though we had a few hassles setting it up: the QR code in the pamphlet that came with the box initially led us off on a maze through Dyson's international web site; starting again, the second time worked ok. The Google Assistant integration is able to turn it on and off, control the fan speed and temperature. Seems one-way, you can't ask Google to report the air quality.

The unit has an "airflow direction" feature that reverses the air through the fan. When you press that button the fan stops, makes some noises internally, and then starts up again blowing very lightly out the back. The heater is disabled when you do this. I have no idea why you'd want to run it backwards.

A big selling point for this particular model - the Purifier with Formaldehyde - is the air filtering. Despite my home's propensity to poor air quality, the Dyson consistently reports very good air quality. I've pushed it by burning candles and even incense near it, and also by leaving the door to the patio open when I had a rather smoky fire pit going. Interestingly even burning incense right next to the unit in the 25m2 room didn't degrade the air quality levels according to the Purifier, so presumably the filter was able to easily cope. When I moved the Purifier and incense to a much smaller - less than 10m2 room - and the incense was practically intolerable - that the machine reported poor air quality. The numbers jumped all over the place though - with PM10 and PM2.5 levels rapidly changing from low (40ug/m3) to off the scale (999ug/m3) and everything in between. The colour banding is a bit weird - it goes from green (good) to yellow, through red and on to purple then blue is the worst. I have expected red to represent the worst.

The VOC, NOx and Formaldehyde measurements all reported the lowest levels / "good" over the last couple of weeks, including my "intense incense" test. I'm not too surprised though - we are fortunate in Australia that it's uncommon to experience poor air quality (mind you, unless we see genuine action from our governments that's likely to change in the decades to come...).

So in summary: the Dyson Purifier Hot+Cool Formaldehyde HP09 makes a great heater. At least for my home, the Formaldehyde feature and indeed the Purifier function seem not that useful, so I'd probably have been perfectly happy with the much cheaper - but still pricey - plain fan/heater version.