What Color Wire Goes Where On A Thermostat

By | August 14, 2022



As summer approaches, many homeowners are asking themselves, “What color wire goes where on my thermostat?” It can be a confusing task, even for experienced DIYers. Knowing which color wire should attach where can make all the difference in whether your air conditioning system runs efficiently and effectively or not.

Let’s start with the basics. Most thermostats will have five wire connections: Y (yellow), G (green), W (white), R (red) and C (common). The R connection is usually found on the device itself; the other four are each connected to the wires within the wall. To make sure you are connecting these wires correctly, you should understand how they function.

The yellow wire is used to move the blower motor’s speed up and down, while the green wire is used to control the fan. The white wire is used to power the thermostat’s internal controls and relays. The red wire is used to heat the system, while the blue or black wire is used to cool the system. Finally, the C (common) wire is used to provide the power source to the thermostat’s control board. Once you have connected each of these wires properly, you should be able to program and use your thermostat as normal.

To ensure that your thermostat functions correctly, it’s important that you understand the colors and their corresponding functions. Start by verifying the colors of the wires connected to your thermostat. Then connect the wires to the proper ports and make sure that everything is secure and working properly. If you have any questions on which color wire goes where, contact a professional and have them come inspect your unit to ensure that your thermostat is working correctly.


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