you’ll need to make sure you have an available C wire if you want to use the Honeywell. This is a low-voltage return wire that’s an essential part of powering the thermostat – ask a ...

Automate your air conditioning with top-rated thermostats from Ecobee, Google Nest, or Honeywell Home The best ... older HVAC system that’s missing a C-wire. (Most smart thermostats require ...