Welcome!
I was just thinking about your decision to keep your house at 67 all winter. With your current setup I agree with your decision. However what if you had a programmable thermostat that had a heat pump only mode? I have no Idea if such a thing exist, but if it did you could drop the house down to low 60's during the day, and at lets say 4:00 the heat pump could turn on solid for an hour and bring the house back up to your comfort zone. Just an Idea . . . . .
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