Home Thermostat Wiring Color Codes

By | April 7, 2023



It’s essential that your home thermostat is installed correctly to ensure efficient and safe climate control throughout the year. The majority of modern thermostats are color coded, making it easier for homeowners to wire them up correctly.

When connecting a new thermostat, it helps to understand what each color of wire stands for. Here's a brief overview of home thermostat wiring color codes:

The Red Wire connects to the “R” terminal on your thermostat, and it carries 24 volts of power from your furnace or air conditioner. An additional red wire may be found in three-wire systems, which is used to provide power to an outdoor condenser. The Green Wire is connected to the “G” terminal on the thermostat, and it controls the blower fan on your furnace. The Yellow Wire is connected to the “Y” terminal and activates the compressor when cooling is needed. The White Wire is also connected to the “W” terminal, and it turns on the heat. Finally, the Black Wire is typically connected to the “C” terminal, and it serves as a switch between heating and cooling modes.

By familiarizing yourself with these home thermostat wiring color codes, you’ll be able to accurately connect your thermostat and ensure it functions properly. Understanding wiring colors can help avoid costly repair bills caused by incorrect installation. It’s always best to consult with a professional if you have any doubts about what you’re doing.

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