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: ...

The thermostat requires a C wire for power, and for those without ... If you don’t feel comfortable with basic electrical ...

For the wired thermostats, we also note whether each comes with a wiring adapter, which allows you to install the thermostat even if you have an older HVAC system that’s missing a C-wire.