I don't know about the winter air thing. Here in the south, the air outside is much more humid than we want, especially during this hot summer. I could see in the winter where fresh outdoor air might be good to get, but I doubt the engineers took any of that into account, seeing as how they designed a terrible a/c system. People who drive a Toyota Tercel drive more comfortably in the summer heat than most in a MB owners do.

And for those with fogged up windows in the winter, they need only to use Windex on the inside of their windows; that'll clean 'em.