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I have a Trane XV95 two stage furnace, wired up to a single stage thermostat. The W1 and W2 ports on the furnace are jumpered. Currently has a 4 wire cable. I'm trying to figure out if it's worth running a new 8 wire cable and getting a 2 stage thermostat to control this... or if I should just leave well enough alone. If I do run a new cable, I'd like to have a C wire, I assume that just hooks up to the "B/C" port I see on the furnace?

[Furnace Wiring1

Thermostat Wiring

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  • Do you have an idea of the heat load of your house? (From a Manual J calculation, usually) Aug 3 at 4:15
  • I don't... Spokane area, if it helps. Home is 2000 sq ft, well insulated, and the furnace is a TUH2B060A9V3VAA.
    – Bemercleg
    Aug 3 at 4:50

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