> There are quirks - the COP is different for lower temperatures, and becomes 1:1 at around 5F (-15C).
It depends on the unit. Some (Mitsubishi FE12NA) have a COP of 1.75 even at -10F / -20C. See Table 6:
It depends on the unit. Some (Mitsubishi FE12NA) have a COP of 1.75 even at -10F / -20C. See Table 6:
check chart on: https://www.researchgate.net/figure/Coefficient-of-performan...