4 ms·

Source live in cold country. Heat pumps work lovely till -5 to -10. Then most folks start using extra heating.

• dx034 4y ago
  F or C?
  • timbit42 4y ago
    Probably F. New heat pumps are usually good to -20C or -25C, which matches -5F to -10F. My heat pump is 11 years old and is good to -15C.