You can, but the lower you go (usually starting around 30F), performance degrades, with around 15-17F being the lower limit that you can run it in heating mode and still pull heat out of the outside air.

Ideally your aux heat would only be needed on those more extreme days.

btrfs send/receive to my NAS.

I’m just all in on the Ryobi battery walled garden. I swear they make everything that will take one.