this post was submitted on 12 Sep 2023
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If you're on propane, it's more likely to be cheaper. Particularly over the course of an entire heating season, because they're more efficient in fall and spring than the coldest part of winter.
But yeah, this study wasn't looking at cost per therm but just raw COP, which is a pointless metric. It doesn't even compare the number of watts of heat from burning natural gas in a furnace vs in a modern power plant that supplies a heat pump. Although since we don't have a carbon tax, that's only a theoretically interesting comparison.
Heat pumps work fine for most people in the north. Mitsubishi's cold climate heat pumps supply 85% of their rated heat at -13F. Buffalo is a city known for its winters, and the last time Buffalo's lowest temperature was below that was 1982. They're just going to be a more expensive option for most people right now.