this post was submitted on 24 Oct 2023
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You need to consider that some walls may contain water pipes. Not having those warmed up sufficiently could lead to a bursted pipe, which could lead to significant damage.
Whats the min temp to be responsible but also keep the central heat waste to a minimum?
Cautionary tale:
For us it was trial and error. We thought we were doing pretty well by keeping track of the weather and balancing the whole house heating vs single room. Until we had a snap freeze that plummeted the temps overnight to an obscene degree. We were comfortably warm in our bedroom as all the pipes in the kitchen and bathroom were bursting.
10's of thousands of dollars in demolition and reconstruction later we have decided that in this instance it's better to waste some small amount of energy keeping the whole house heated rather than risking another catastrophic failure.
Your mileage may vary.
Fwiw there is low power heat tape you can buy to run along pipes to keep then from freezing. Had this on a pipe that ran through an attic and would freeze when the outside temp got extreme, despite heating the house.