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jnthn123 · 08-23-2023

Hi. I am trying to replace an old Carrier thermostat, which only has 2 wires (V+ and Vg). I've called HVAC companies around and been getting various responses from "I don't think thermostats work with only 2 wires", to a $400 quote, to a "big job $15...

jnthn123 · 08-23-2023

Thanks for the info. I am comfortable doing wiring myself (plus my budget can't swallow those quotes). I need to find some time to scope the inside of the wall (through the small hole) or trace the cable in the attic. I don't know how many conductor ...

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Try to replace an old thermostat with a Nest thermostat

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