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 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_my_gas_furnace_with_a_heat_pump_a/ https://www.reddit.com/r/bayarea/comments/10lxyso/replacing_...