If you have ceiling fans, turn them on, and make sure they are on the forward setting so the breeze blows downward
. This keeps the air circulating, and will cool a room 6 to 7 degrees. You can also keep your window blinds and curtains closed, which will trap heat between the window and the blind. Your best bet though is to keep the heat from getting in your house. Planting a tree or other large plant in front of windows that get the most direct sunlight will block a lot of the sunlight from entering your house and is also good for the environment.