3 ms·
>But if you are trying to heat your house to a livable temperature while it’s -20 outside, your efficiency is terrible. For air source, in the north (at least
by maerF0x0 6y ago
>But if you are trying to heat your house to a livable temperature while it’s -20 outside, your efficiency is terrible.
For air source, in the north (at least in canada) they use ground source ones put below the frost line. So the ambient temperature down there is >0C .