Why do car windows perspire in the early early morning?

Question

Every morning when Im headed to work I have wet foggy windows. How can I prevent that, if I can? Most cars have it but I notced that some cars dont have it as bad or at all. I hate it. It drives me crazy!!! Any ideas to get reid of it???

Answer 1

Generally you'll see this in older model cars.

Basically it's just moisture getting into your car overnight somehow, and building up on all the glass. My car's window doesn't allign properly with the door frame when you shut it, so I usually wake up to foggy windows due to the small space where moisture can get into my car.

I'm pretty sure you can buy a sort of spray/coating to put on your windows that can help prevent the fog/moisture build up, but don't quote me on it.