Our previous house was a modern 2x6 construction with oil heat.
So I used to keep it at 40F.
It was a HUGE difference, heat didn’t even come on until around January.
I had multiple alarms that would call me if temp dropped below 40F.
It didn’t give much buffer in the event of a power failure but I never had a problem.
We used about 200 Gallon oil a year.
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