I don't think there is a car in production where the heating is coming not from the engine.
Of course there are some cars which do have a resistive heating, but which are those?
> heat pumping through AC
Uhm, the compressor runs from the engine so while the heat is not from it, it's still directly relies on availability of running engine.
Also don't forget that seat heaters are also resistive and most cars in cold climates have them.
I know it (or more like my bum) too damn well, though I didn't think about them in this case.
> small diesels like VW Polo
Makes sense, though as I understood, it's strictly auxiliary till the engine is heated aaaand maybe some additional heating at the parking lot with the engine turned off, though I would wary of this usage, it would drain even the extended battery fast.
Overall it's not quite what I had in my mind (think of space heaters), though yes, there are some parts which can operate independently from the engine, though it's not a primary function for them.
Thanks for the hint.
If we look at the total energy consumption for driving in cold conditions, then moving the vehicle along the road needs in the ballpark a similar amount of energy as what is required to heat up the interior of the car to a reasonable temperature and keep it there - cars aren't (and probably can't be) as insulated as houses, so they need quite a lot of energy to stay so much warmer than the outside.
In an ICE, most that heating is done from waste heat of the engine. In an EV, that comes directly out of your range.