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What is rc and rh on nest? If you don't have an rc wire, the rh wire is the power wire for both your heating and cooling systems. If you have an rh and an rc wire, the rh wire is the power. The old thermostat has a red wire that is plugged into the port labeled r.
The nest has a port for rc and rh but no r. Where does the red wire. "rc" and "rh" are terminals on an hvac thermostat, each with a specific function. What is the difference between r and rc on a thermostat? Thermostats which have r and an rc terminal are heating/cooling thermostats. The rh wire connects to the rh terminal on your thermostat. What does the rc wire do on a thermostat? Red or "rc" wires rc wires are only for air conditioning systems or dual. If you only have one r wire (no rh or rc), you can connect your r wire to either rc or rh on the nest thermostat.