So, the c wire doesn’t actually provide the power. In order to have a circuit that power can flow through, wires need to connect back to the HVAC control board to complete the loop. In that case it will typically be labeled R h/c. Sometimes they are separate wires and require separate connections. They provide a source of 24V power coming from the HVAC control board. Typically, the wires that provide the power (often called the “hot” wires) are labeled R c (cooling) and R h (heating).
Although there are some best practices, there are no strict standards that wire name and color adhere to.Īlthough I’ve seen it stated in several places, it’s not entirely correct to say that the c-wire is what powers the thermostat. Keep in mind that it is not necessarily labeled as c and the wire is not necessarily any particular color. It is often labeled as “c” on thermostat backplates. It’s normally used to provide a return path to power the thermostat. The c wire is an extra wire that can be used to provide a return path for continuous 24V power for any application.
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