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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.