4 ms·

I don't think they are more efficient in Norway harsh winters..

• monochromatic 10y ago
  That's actually a reasonable point, and it may be true. There's got to some temperature delta makes a heat pump a losing proposition, but I'm not sure how big that threshold is.
  • johnward 10y ago
    I accidentally replaced one of my heat pumps with an A/C only unit. So now I have to run the emergency heat strip all winter. I haven't seen any real increase in my power usage. The heat strip was running most of the time anyway because of low temps.
• fulafel 9y ago
  Recent winter pumps work pretty well down to -20C, and don't get any worse than resistive heating after that. In the north of Norway, Tromso, the lowest monthly average temperature is -6C for January. Coastal Norway is surprisingly warm due to the ocean and Gulf stream.