It looks like DC's headed for another heatwave with temps this next week headed towards 100 degrees. Over the next few days, I'll be posting ways to keep your house cool and green without spending an arm and a leg.
Keep air moving with fans. Even if you have A/C, ceiling fans and box fans can keep air moving through your house, and let you keep your A/C at a higher setting. If you don't have AC, set a box fan (securely) in an window and let it catch some additional breeze. If you're really hot, let the air of a standing fan blow across a bowl of ice. With ceiling fans, since hot air rises, the fan should rotate counter-clockwise in the summer to help keep the hot air higher. Look for fans that have an Energy Star rating.