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i have one of these sitting on a shelf that i haven’t installed because my old house is missing a wire… and like what, i’m just supposed to fish a new wire down the wall like a pro?

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Depends which wire you're missing. IIRC, the five wires are power, ground, heat, cooling, and fan. The fan one is often missing, and either heat or cooling could be missing if you don't have it on a thermostat.