 Grandma would be appalled at these homes that are built that don't have very many windows that can open up. They're all glass, but none of it opens up because of air conditioning. Well, Grandma knew that if you opened your windows at night and allowed all that cool air to come into the house, one, you're probably going to sleep better when it's nice and cool out rather than when you're flopping around and sweating and hot and everything.