Willravel

The idea is that in whatever area is right under your roof, heat can collect. In a standard home with an attic, the heat gathers between the roof of the house and your ceiling, and without proper ventilation can actually heat up your house pretty badly. It also presents an opportunity to make a buffer zone between your hot roof and ceiling, if you have an area between your ceiling and roof. If you can keep cooler air moving through that space, it can prevent the cumulative collected heat in that space from heating your home, and can actually keep it near the temperature of a shaded area. In my house, I'm going to be installing several attic fans to promote circulation. We're anticipating having to use our AC less because of it. BTW, they make solar attic fans, so when the sun is out, your crawl-space is ventilated.