As of March 6th 2019, Dux is offering each reviewer a Parts and Labour Warranty Extension from one year to three years to their customers to encourage them to write a positive or a negative review. It is possible that reviews were written by customers who received such a reward.
Unit has functioned perfectly for 5 years. First service cost $150, nothing major was required other than slight thermostat adjustment the unit is in perfect condition. The unit is housed indoors and has never gone wrong since it was installed. Call out for service was arranged from the internet, received a callback the next day and the day after that the unit was serviced.
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