Rebecca Posted December 30, 2018 Report Share Posted December 30, 2018 We have an old Wesco furnace circa 1979ish. Trying to install a Sensi touch screen thermostat. I had no problem taking the mercury thermostat off the wall and finding extra wires behind. When crawling under the house, I cannot figure out where I should be connecting the wire of the same color for the common wire. The cream color and red wires are the same as the two on the thermostat upstairs. Quote Link to comment Share on other sites More sharing options...
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