We had Home Energy Products install a hyperheat minisplit system last summer after we bought a house that needed boiler replaced. It worked perfect last winter and we didn't have any issues with it not keeping up - even during the coldest nights. We setup a small spaceheater in bathroom in the event that the temp dropped too low in bathroom but to my knowledge it never kicked on and bathroom felt warm enough. Our most expensive electric bill last winter was around $350 for whole house (everything is electric). We are usually only there on weekends so it would probably be higher for someone there full-time but we didn't set heat below 60 as it was first winter in the house and we wanted to make sure pipes didn't freeze.
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