I have the basic, single stage Carrier heat pump, with the original basic thermostat. It has been working fine for almost 10 years, and every room is within one degree of the thermostat setting. Once, about 6 years ago, my capacitor went bad, and Munn's came out and replaced it within a few hours. There was no charge because he system was still under warranty. The only change I ever made was that I use MERV 11 filters instead of the standard MERV 8 and I change it every 6 months. I found that these seem to make the house quieter and less dusty. I pour a gallon of hot tap water down the condensate drain every month, and I inspect the coils for dirt but I have never needed to clean them, although I have hosed down the outside unit. I have never paid any company for maintenance.
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