4 ms·
Modern cold-climate heat pumps can definitely handle 20F. Yes they're more efficient at higher ambient temperature, but you can get at least 2.5 COP at 20F. (An
by tempestn 3y ago
Modern cold-climate heat pumps can definitely handle 20F. Yes they're more efficient at higher ambient temperature, but you can get at least 2.5 COP at 20F. (And good ones can continue to outperform resistive heating at much lower temperatures than that.)