While the previous winter's chill has many of us dreaming of hot, steamy days, the summer months are near and quite possibly might have us dreaming of cold, wintery days. To keep your home cool during the summer without turning on the air conditioner, open the right windows in your home. According to the Natural Resources Defense Council, open low windows just a little bit on the windy side of the house, and open the window wide on the opposite side. This will draw cool air through the home with a tunnel effect, creating a cooling breeze. But during the hottest times of the day, close windows to trap the cool air inside.