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I need to run new thermostat wire since I don't have a C wire to power my smart thermostat, but need some guidance on where to hook it up. I have five wires at my thermostat, two going back to my furnace in the basement and the other three going to my attic where the A/C is located.

thermostat furnace furnace furnace furnace

  • Can you take the Nest base off and show us a closeup of the wiring coming out of the wall at the thermostat location, as well as a photos of the wiring at the air handler? – ThreePhaseEel May 19 at 23:19

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