“I have a Goodman forced air gas furnace and no central air. There are only two wires hooking up current Honeywell thermostat. I purchased a rth9585wf. I’m assuming I use the G wire and C wire terminals. Is this correct, and does it make a difference?”
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No, you will need to run a new wire from the C terminal on the thermostat to the 24-volt terminal at the HVAC system. If you require further assistance, contact 1-800-633-3991, or through Twitter and Facebook under Honeywell Home. -Jerry
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