Our RAV4 Prime has a heat pump but no resistive heater. What this means is we have heat while in EV mode down to the teens but colder and truthfully in the low teens, we have to force the ICE on to get decent heat.
Also while the summer EV range of the Rav4 is around 40 miles, the winter range even with the efficient heat pump heater is closer to 30 miles.
What my wife does in the very cold cold as her travels are generally 50 or more miles is to force it to ICE for her morning single digits commute, which gives her toasty heat and saves the EV and heat pump heat for her afternoon return when temps are warmer.
While I wish the Rav4 had a bigger battery so she could do all her commute in EV mode, it's basically the best PHEV currently available.
In a way I'm thinking I might have liked a full EV with an ~250 mile range which would have given us all her driving in EV, in not too long when she's not driving so much, we should be able to do almost all our driving in EV and just have to use the ICE for a half a dozen long trips/year. Note I kind of wanted a Toyota and the waitlist for the EV Toyota AWD that I liked was even longer than the 2 years it took to get our Rav4 Prime and I'd been waiting sometime before I learned about the BZ4X and I was also a bit leary about the issues Toyota has been having with their very new BZ, the Rav4 Prime has been round for a bit and seems to have had the bugs worked out for the most part.