Take a photo of the wiring with your smartphone so ... which powers the thermostat. “We recommend using a C-wire to provide ...

Scope out your wiring. If you have a ducted HVAC ... If you know you don’t have a C-wire but you really want a smart thermostat, you have a few options: ...

For the wired thermostats, we also note whether each comes with a wiring adapter, which allows you to install the thermostat ...