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According to the ADD-A-WIRE™ Owners Manual, you should be able to use the product to achieve your goal. I've never used this product, and do not endorse it in any way. I have no idea if it actually works, I'm simply going on the claims made by the manufacturer. This is the diagram from the manufacturer. This is how I'd wire it up. R and W stay ...


Terminals R and C are a 24V AC power supply, from a transformer on the control board in the furnace. The control board also has relays: one is for the fan, one is for heat. One side of the coils of these relays are connected to the G and W terminals respectively, and the other side is connected to C (one side of that 24V AC power). Your thermostat is ...

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