I have two thermostats in my new home. One is an old round Honeywell
thermostat. I took off the cover, and here is the wiring I see. I
believe this thermostat only controls heat, and not air-conditioning. I
have a second thermostat on another level i...
It does appear that I have one furnace with two thermostats. The main
living level has a more modern thermostat, see photo attached, that I
would also like to replace with a Nest. That thermostat controls both
heat and AC. Am I able to replace both t...