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redditmpm t1_j9y3uqc wrote

You will need to run a third wire (a constant). It’s pretty common when upgrading to a fancier thermostat. There should be a spot on your furnace to attach it. If pulling a new wire is doable, it’s a pretty easy job.

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Senior_Cheesecake155 t1_j9ybezt wrote

I would definitely look into pulling a new wire, and I’d run at least a 5 wire, if not 7, to allow for future upgrades.

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