![]() If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. Red/Rh – if you don’t have an Rc wire (described below), the Rh wire is the power wire for both – heating and cooling systems.Red/R* – power wire for your heating and cooling system.Each of these wires has a name featuring a single letter. Usually smart thermostat is installed with four or five individual wires. Thermostat C-Wire is that extra cable providing extra power to the smart thermostat. They use more power than old thermostats and need to have their own power supply. Today smart thermostats connects to WiFi network, have back-lit display and several sensors. In an older days thermostats were pretty basic and they did not need their own power supply. ![]()
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