Blinds definitely help. I've heard that if you have horizontal mini blinds you want to turn them up so it reflects the sun back and not down where the sunlight

Blinds definitely help. I've heard that if you have horizontal mini blinds you want to turn them up so it reflects the sun back and not down where the sunlight streams in. Keep fans running even if you're not in the room. It'll keep the air moving. Make sure it's rotating in the right direction (switch down for summer, up for winter) Turn off incandescent lights. Check your AC unit, I recently found mine needed to be recharged. The AC should be 20 degrees below ambient temp. Any sort of insulation improvements. In a house I lived in during college I found that the 3M Window seals helped immensely, and closing the fireplace flue. Get rid of that Pentium 4 box sitting next to you :)