Nest Google Thermostat Power Connector (snow)FeaturesMaterial: Thermostat Made In Taiwan Installation is simple; the Nest Power Connector attached to your furnace air handler, or zone controller and comes with simple instructions; no wiring or drilling required Nest Thermostats are designed to work without a C wire in most homes but for some systems, including heating-only, cooling-only, zone-controlled, and heat pump systems, you'll need a Nest Power Connector or C wire