“I have four wires in my current Honeywell thermostat but no C wire though. Will this thermostat work with batteries or is it not compatible? Is the C wire my only option for power besides batteries?”

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• Hi Newbie! Thanks for reaching out, in a four wire application you do have the option to preform the G-wire solution, this is where you will utilize one of your other wires for power, please see the following how to video; https://www.youtube.com/watch?v=TT4vbK1K1wo

  Answered by Honeywell Support 7 years ago

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• Can't use batteries. Need power source with either c wire or buy power supply and plug in. Best to hire electrician and have the c wire electrified.

  Answered by DavidS 7 years ago

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