[jcalvinowens]

The manual for mine just gives two COP values: 3.63 at 47F, and 2.44 at 17F. That puts the cutoff for me at 30F, which is absolutely as cold as it ever gets in the bay area, so I only have the heat pump.

This is a longer explanation I wrote up when I replaced it: https://www.reddit.com/r/bayarea/comments/10lxyso/replacing_...