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Thermostat & HVAC C. Thermostatic Controls - Thermostat & HVAC C-Wire Setup - All, Recently just purchased a new Honeywell WiFi Thermostat (RTH6580WF) that says it requires the C-Wire to be able to power on. When www.doityourself.com
Thermostat Install "C" Wire, HVAC Experts!! . I have a question for all the HVAC experts: I'm trying to upgrade my thermostat with a Wi-Fi unit that requires the C wire for power, I checked my thermostat and it only has 4 wires G,Y,W,Rc,Rh (Rc www.diychatroom.com
