Do I need a C wire to install my new thermostat?

Yes, any Honeywell connected or Wi-Fi thermostat requires a wire connected to the C terminal to power the thermostat.

If you do not have a C wire, there are several options that you can choose from in order to make your Honeywell Wi-Fi thermostat functional. Please see What options do I have if I don't have the "C" or Common wire? for more information.

Last updated: September 14, 2017
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