>
> Most cars already have electric rear window defrosters, note the black
> electrical grid.

Also most cars have electrically heated door mirrors, locks, and other
things you perhaps don't realise.  On out Audi if the locks are iced up
if you yank on the door handle and its cold enough a heater element
will kick in.

I think the idea of trying to heat the inside of a car electrically
isn't practical, generally a car on a cold morning already has a fairly
high electrical load, with all the other heaters, wipers, lights,
blowers etc running. You'd need at least a KW to make any real
difference, and there is no capacity for that.

> And let's not forget about the (few) electric vehicles out there.
> Something
> tells me they use electric windshield defrosters.

Electric cars typically have a small petrol or paraffin burner to
provide heat for this purpose.
Many top end cars, ie Range Rovers, Audis, etc have the option of a
cabin heater, which is a programmable device with a small heater which
burns some petrol to heat up the car for you in the morning at a preset
time to a preset temperature.  This is very handy also if you ever have
to sleep in your car / land rover.

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