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For efficient defrosting, the glass can be heat directly with electricity. Ford and others did this, with a very thin (sputtered) gold coating on the glass, apply electricity and it clears mist or frost within a few seconds.
We are so used to a ICE with all that waste heat -- you can heat the entire inside of the car easily. But heating the air to heat the glass and powering the fan, as well -- is just about the worst way to do it in an electric car.
One of the things I'm doing with the CarBEN EV5 is thermally *insulating* the entire car (foam core composite sandwich) and the side windows will be double glazed, if possible. This will make the inside more comfortable in all weather.
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