Hi EVman
I worked in the H&V industry for Donkey years in my past life and seen massive office complexes fitted with heat pump, 100’s of them per floor but they were always backed up with good old fashion gas burning boiler houses and refrigeration plant.
So I’m not convinced unless the tech has improved that much the past 30 years, could of done I suppose but if its that sufficient now how come we don’t see them in our homes. The answer to could be how much energy you have to put in to get something else out so with electric cars you can sit in the warm or cold but might not have enough energy to get you back home.
These things will be solved in future I’m sure but a heat pump sounds to good to be true but can’t say for sure because I’ve not used one in a car.