These haven’t been cold temperatures that would have caused any aux heating issues. There are multiple variants of furnaces and heat pumps and we in the villages have the simple/less efficient 1’s installed (not talking about the seer rating, I’m talking about single stage vs. multi stage setups). I had a heat pump installed in my home in snow country that was beneficial down to 0 degrees and this setup was a multistage configuration where it operated efficiently at low temps by using more and more of the furnace as the temps dropped (stages) instead of the units coming on all at once say at 30 degrees.
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