![]() ![]() Let’s take a systematic and practical approach here. “What if there is no C wire for the thermostat?” (Older thermostat you can leave it without or add it) “What is the black wire for on a thermostat?” “What is R and RC on the thermostat?” (Color coding diagram below) “How many wires does a thermostat need?” (At least 2) ![]() “What color wire goes where on a thermostat?” (Check the diagram below) We will also try to address all the common questions regarding thermostat wiring, such as: The protocols apply to Honeywell thermostat wiring as well as for other thermostat wiring. In all cases, we will use this basic Honeywell thermostat for reference: This is a standard Honeywell thermostat perfect for learning the ins and outs of thermostat wiring. At every stage, we will point out what 2 wire or 5 wire thermostats are used to wire, for example, to get a bigger picture of where those color wires go and how they enable the functions of air conditioners and furnaces. ![]() We will cover the most common thermostat wirings for 2 wire, 3 wire, 4 wire, and 5 wire thermostats. There are, after all, many different types of thermostats with different wiring out there: Honeywell thermostat wiring, nest wiring, old thermostats, and so on. 100% of guidelines will not work for 100% of thermostats. Obviously, there are many different kinds of thermostats out there. We will cover everything you need to know about thermostat wiring including where does each color wire goes. LearnMetrics has designed this guide as that little help. With a little help, you can learn how to install a thermostat on your own. Thermostat wiring is a useful skill to know if you have to replace an old thermostat or just check if something is wrong with the new thermostat. Thermostats are the ultimate control hubs for HVAC devices such as furnaces and air conditioners. ![]()
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