There's a lot of inertia against heat pumps for reasons that are not at all clear. Where I live, in a pretty northern climate where until recently almost no one owned an AC but climate change is very visibly changing that, it's very difficult to get HVAC people to take you seriously if you say you want a heat pump even if you're getting an AC anyways.

A lot of it seems to stem from the fact that most heat pumps operate poorly or inefficiently below about -10C (some higher than that). The fallacy that lies behind the inertia seems to be that "if you can't use it exclusively, you shouldn't bother at all". Since there's a non-trivial number of days below -10C where I live (about 1078 hours spread across 89 days here last year), it's considered frivolous.

Of course, because we build our houses to hold in as much heat as possible for winter, now that it's getting over 20 and 30 a lot more a lot more people are buying AC, which is all of a heat pump other than a reversing valve, so to me it seems silly to NOT get a heat pump for the like 200+ days in between peak heat and peak cool seasons.