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Heat pumps will have to work harder in sub-zero temperatures, but are still two to three times more efficient than fossil fuels, according to a new report by Oxford University published on Monday in the Joule scientific journal.  The study could put an end to an ongoing debate about whether heat pumps are a true energy efficiency solution in colder regions.  Specifically, the study found that heat pumps use two-to-three times less energy than fossil fuels in temperatures as cold as -20 C. The study claims to put paid to misinformation…