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enter image description hereMy current thermostat is wired as follows and the wires are from my Separate heater and separate AC air handler:

W - From my heat R - From my heat

Rc - From my AC Handler Y - From the compressor G - From the AC Handler

Do I need to add a wire for the C connection but am unsure whether I need to do that how and where to connect it. Our can I do something else with the G wire? I have attached a pi of my current schematic, can anyone please help?

Dave S
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In the picture below you can note that the connection labeled with a 7 in a triangle is the "C" of your fan controller. As per your added note to the diagram this is also connected to your A/C unit so there is a common "C" between your A/C and the fan controller. This same place is where you want to connect a spare wire to run for the "C" terminal on your thermostat.

enter image description here

Michael Karas
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