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I tried what you advised above but this fried my thermostat because I didn't have a meter to check voltage and it was apparently much higher. The wires are enormous. This is most likely the actual...

Hi Folks,
I have a basic Honneywell programmable electronic thermostat (Honeywell RTH221B) that I would like to use to replace the existing very basic and very old (turn knob type) thermostat in my...