I’m not a HVAC tech, nor do I play one on TV. I can only speak from experience in Phoenix.
Heat pump I’ve had for years is good for raising the outside temperature in the ‘30’s to 75 degrees inside, but more importantly, reduces 120 outside to 75 degrees inside.
Works well for those cases.
It is all so confusing .. really.
I was born and raised in Fort Lauderdale and I honestly don’t remember IF we ever had to use any type of heater to warm the home in the winter.
I will say this though .. Until I went away to service, I never had the luxury of AC either!
(Well .. Didn’t have AC in southeast Asia either but did have it when I came back to the states!) 8)