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The problem with heat pumps in northern areas is they work until it’s cold outside.
So get a hybrid system, likely to get your money back in a few years of savings.
Also how cold is it, mine is productive up like -35°
Above the Arctic Circle North?
Otherwise, you’re full of shit.
They work basically unimpaired into zone 4b, which includes all of northern Michigan. This encompasses something like 95% of the entire human population.
They will need some support on the coldest days in up to zone 2b, at which point their efficiency drops to a mere 100%.
You’re spreading fossil fuel industry FUD. Fuck off.
So switching from propane to methane. Cool. Coooool. Cool cool cool.
But it’s natural. It must be good for you.