Came here to post just that,…
Came here to post just that, as soon as I saw 'heat pump' I knew the problem. Amazing machines, super efficient heating and cooling, but pointless in any area where the summer is so dry that evaporative cooling is actually capable of doing the same thing for cheaper, or where winter is cold enough that you can no longer essentially 'air condition the outside to warm up the inside'
I heard they were good down to like 15 degrees F but even so, that disqualifies a ton of places. Even if you only have like 3 really cold days a year, those will be the days you need heating most.