I've been trying to get my energy bill as low as I could. That means using the ac/heating close to none.
In the middle of the home, there's an attic access, 2x4 feet big, covered with an insulated piece of wood. On hot days, I open in up, letting hot air escape to the attic and that alone makes the house 7 degrees colder. On cold days I close it up and without any heating, the house stays 10 degrees warmer than the outside temperature.
I wonder if anybody has use their attic on a more sophisticated/techie way, using temperature controlled fans or some other equipment.