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When wiring, each wire should be identified by what terminal s it connects to — never by color. The thermostat uses one wire to control the primary functions of your HVAC system, such as heating, cooling, and fan. Follow the instructions thermostat to thermostat you through basic wiring: Wire protect your equipment, turn off the power at the breaker box or switch that controls your heating and cooling.

To confirm your system is off, change the temperature on your existing thermostat, so the system starts heating or hookup. You can skip this step if you have a digital thermostat with a blank display.

How do I wire my thermostat?

Next, remove your existing thermostat from the wall plate. Most thermostats pull directly off the wall. However, some lift from the bottom and lever off, and others have a locking tab. Take a picture of your wiring. Make sure the terminal markings are visible. Review your picture and confirm. Your hookup thermostat may not be directly compatible if you see terminals labeled A B C, or 1 2 3, as your system requires a communicating thermostat. If you see thick, black, or red wires, you have a line voltage system.

This type of wiring thermostat a line voltage thermostat and is not compatible with low voltage thermostats. If you see wires connected to terminals labeled G1 G2 G3, you need a thermostat capable of controlling multiple fan speeds; none of our retail thermostats are compatible with this system type. G is compatible, but not G1, G2, or G3. You should typically see an gauge solid core wire. The most common configuration is five wires.

However, you could see as few as two and many as ten. Make a note of any present wire not connected to a terminal. Do not label these wires.

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Referring to your photo, remove and label each wire. If we recommend placing a wire in a terminal, do not move it to another terminal if we address it later in the guide. You typically have one or two of those three. Thermostats may have a jumper switch, metal staple, or plug. The jumper may also be a wire connecting the two terminals.

If you have more than one wire for example, you have a wire labeled R and another wire labeled Rcremove any jumpers between the R and Rc terminals or push the switch wire open the RC terminal to insert a wire. If you have a Trane hookup thermostat and a wire labeled X more info B, refer to your thermostat manual.

In some cases, one of those wires is your common. If you have a C wire, place it into the C terminal on your wall plate.

C wire adapters are available here. This wire goes to the G terminal on your new thermostat. If your O or B terminal shares a label with another wire — typically W —identify whether you have a heat pump system or not. A heat pump runs your compressor for both heating and cooling. Locate any unconnected wire labeled W or W1.

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