Q: I'd like to put in a new programmable thermostat to better control my energy costs. While there isn't an official standard for thermostat circuit wiring colors, there is a general pattern. Electric baseboard heaters are good for spot-heating areas of your house that central HVAC does not reach. Smart thermostats are an innovative and easy way to help save money on your energy bills. If you have both an Rh and an Rc wire, the former powers the heating and the latter powers the cooling using two separate transformers.
Furnace thermostat wiring falls in the DIY category that a handy type person can hook up or fix.
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