Heat pumps drop in efficiency the colder it gets and only work down to a certain temp. If the outside coils get too cold they freeze up preventing it from funct

Heat pumps drop in efficiency the colder it gets and only work down to a certain temp. If the outside coils get too cold they freeze up preventing it from functioning properly. would be interesting to know how cold the Tesla heat pump can operate down to and if it has resistive backup. Edit: looks like the heat pump only works down to about 14F then it runs the heat pump in recirculation mode to basically turning it into a resistive heater with COP 1, its also seems to have 12v aux heat strips.