The primary power for this thermostat is supplied via c wire (24vac). A "C" wire is not ... About The Google Nest Thermostat G4CVZ is part of the Thermostats test program at Consumer Reports.

Here are five of the biggest offenders people make when using their smart thermostats and tips on how to fix ... thermostat works as intended. Some smart thermostats require a Common or "C" wire ...