If your system already has a C-wire, you can skip this step. If it doesn’t, you might need to add another wire to serve as ...

Nest Thermostat Won't Turn On A thermostat that ... Other possible reasons might be the C-wire, a blown fuse, or other wiring issues. Turn off the power to the HVAC, then check the wiring ...

The primary power for this thermostat is supplied via c wire (24vac). A "C" wire is not required for most installations. This thermostat will work with a 2 wire ...

Installation is similar to that of most other smart thermostats, and if your setup lacks a C-wire, you can still use the Essential by purchasing a Power Extender Kit for $25. The device looks ...