Definitely. I live in the San Francisco Bay Area where it doesn’t get too hot nor too cold, but I do still need heating during winter, and occasionally air conditioning during summer (maybe for 3 weeks or so, sporadically turning on during the day).

I bought the cheapest heat pump I could find that would work with my existing Ecobee thermostat (a Gree Flexx), and even that one says it’ll work down to -22F with a 1.25 COP

I’ve got solar panels, which made a heat pump a better choice than a new gas furnace.