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> This energy was "free" in an ICE,

Does that mean it comes from burning gasoline and it can be filled quickly anyway. Or that heating cabin is byproduct of running engine while driving?

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It's the second one, and ICE typically uses energy that is otherwise wasted when it isn't cold outside. Mind you it has the effect that it takes longer to warm up an ICE car because you need to warm up the engine etc. before the habitacle gets warm where you cet there very quickly with an EV.

the latter

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