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I have additional wires in my wall that were not connected to my old thermostat. Do I need them to install my new thermostat?

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An extra unused wire in the wall can be used as the C wire for your new thermostat. The extra wire will also need to be connected to the C (common) terminal at the heating and cooling system. This will provide power to your new thermostat.

Please note that the C-wire is only needed for Wi-Fi connected thermostats [click here to see our Wi-Fi thermostats]. Most standard thermostats do not need a C-wire.

Please refer to the videos below for more information:

What Is a C-Wire?


What if I Don't Have a C-Wire?


A C-Wire Adapter replaces the need for a C-Wire. The C-Wire Adapter is included in newer Honeywell Wi-Fi Thermostats. If you own an older thermostat model, you can purchase a C-Wire Adapter here.

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