I will try to be brief.
3 years ago we had a York Heat Pump installed. Installer put in a Honeywell TH5000 thermostat. All went well for about 6 months. Then the A/C would not come on. Installer came out and put new thermostat in.
In ther three years, 3 new thermostats have been put in. It always seems to the same routine, either the heat or A/C will not come on. One time it didn't come on at first, but came on about 1/2 hour later. They always come out and fix for free, but we are getting ready to sell the house and just want it corrected once an for all.
Any help would be appreciated.