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                Heat pumps can't take the cold? Nordics debunk the myth
 
            
            (techxplore.com)
          
          
          
          
          
        This is a most excellent place for technology news and articles.
"at those temperatures"
well, to a heat pump even -40° is still 230K, which is plenty of energy to move around and work with. It may be cold to you, but to a heat pump it's not.