In my home the AC system uses a Honeywell TH8110U Touch Screen Programmable Thermostat. It works fine, but it making a clicking sound each time it turns on (and off) which is very annoying.
I called Honeywell support for home owners and the support person explained to me that the clicking sound was normal and almost all of their programmable thermostats by Honeywell have that click because of the relay used. He said of those that are programmable that don't have a click are the Honeywell Magic Stat (models T8112, T8132, T8131), but they don't have a touch screen and can't be used to switch between heating and cooling. For now, the heating has its on old analog(?) thermostat, so that isn't a real concern. I guess worse case, next winter I will have the one for the heating replaced if it can't be on the same thermostat as the AC.
Has anyone experiened this clicking problem with the Honeywell programmable thermostats and replaced it with one of these Magic Stat models? If so, did this fix the problem? Also, if anyone is using one of these Magic Stat models does it trully make no click, no noise at all? Thanks!