- If your thermostat has three wires, they are typically:
- Red (R) for power.
- White (W) for heating.
- Green (G) for cooling123.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Usually there are three wires—red for R (power), white for W (heating) and green for G (cooling).metadomotics.com/heating-cooling/thermostats/h…Basic thermostats use 2 or 3: R, W, G. These control the power, heat and fan. Standard thermostats use 4 or 5 wires: R, W, G, Y, and sometimes C. These control the power, heat, fan, and cooling.airconditionerlab.com/thermostat-wiring/The three-wire thermostat is probably used to control the boilers and hot water heaters. It includes three wires: red, green, and white. You just need to put the same wire in the new thermostat.hvacandcooling.com/index.php/thermostat-wiring/ - People also ask
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