“Is the RTH9585WF smart color thermostat by Honeywell compatible with a 3 wire communicating system? I currently have a TH9421C1004 Vision pro IAQ communicating thermostat. If not, what model do I need to buy?”

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• Not sure if it will work. This thermostat needs a common wire that powers the thermostat. This thermostat is not battery powered.

  Answered by JRGon 3 years ago

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