It’s a heating element, so it’s like a small fan-heater, basically. So yes, almost instantly.
ICE cars often use the engine heat, but I drove a Ford that didn’t… it had a heating element buried in the dash for each vent. I know, because one day they went wrong and one overheated and I had to change it out, and it was literally just a heating element in the airflow that was powered from the battery. It was great, I was so used to cars being freezing until they’d been driven for a few minutes, and had a subconscious habit of keeping the fans off and the vents closed until I’d got going, but that car was instant-heat.
It was fabulous for clearing the window too. Instant hot air so the window cleared in seconds just from the air alone. I’m sure there were other cars that had it, but it was the only ICE car I ever saw that had it.
That’s pretty much how electric cars do it, though probably in a slightly safer way than that one!
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