It has been true in the past that heat pumps had lower capacity than straight resistance solutions although I don't know if that is the case in the new Tesla models, and if so at what temperatures.
... exactly my concern. I may very well be barking up the completely wrong tree here - but I'd be curious to see how it does after sitting for a day or two at -5F. I'm just skeptical on the
We do get spells of days at a time below zero - not terribly often but they do happen. Weeks at a time below 20F is definitely a thing though.
I wish I didn't come across so difficult here - I really, truly don't mean it that way... but I do want to see how they perform "in the real world". Not quite arctic type stuff, but at least what a typical Northeast winter looks like.