I have an analog Honeywell thermostat but would like to upgrade to a smart one. Do I need a C-wire adapter? There is an unused yellow wire (as shown) but I'm not
Honeywell E3Point Alarm Setting - YouTube
I have an analog Honeywell thermostat but would like to upgrade to a smart one. Do I need a C-wire adapter? There is an unused yellow wire (as shown) but I'm not