[kolencherry]

Heat pumps don’t work particularly well below 25F. Our heat pump switched to auxiliary heat (electric resistance heating) with how cold it’s been in Texas.

[StillBored]

Those are just the standard compressor/r410 systems with reversing valves. There are number of systems designed to work well below 0F.

https://www.mitsubishicomfort.com/benefits/hyper-heating https://www.fujitsugeneral.com/us/residential/technology/xlt...