Oxford study proves heat pumps triumph over fossil fuels in the cold::Published Monday in the scientific journal Joule, the research found that heat pumps are two to three times more efficient than their oil and gas counterparts, specifically in temperatures ranging from 10 C to -20 C.
There’s a common reply to these kind of threads that always cites the coldest temperature. That’s almost never meaningful. It just means you’ll have to have a backup heat source, like a traditional furnace or some kind of electric resistive heating. The typical temperatures for the vast majority of North America are warm enough for a heat pump, even for most of winter.