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I was reading about using the T terminal for the C wire for internet thermostat. I have different wiring Thermostat Furnace RC R W. W Y Blank Rh T G. G
The ac works. Can I still use the T wire for C as I have extra wire.

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    Can you post the wiring diagram for your furnace and/or photos of the wiring at both the thermostat and furnace ends? – ThreePhaseEel Apr 10 '18 at 2:00
  • What Thermostat and what furnace do you have (Make/Model). Your Furnace should have a wire diagram internal of the outer panel – Ken Apr 10 '18 at 10:23

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