The fastest way to cool down rooms is to let the fan run counter-clockwise and add some ice in front of any box fans or table fans you might have. You will be surprised by the cooling effect it has. This also means you must drape your windows with heavy curtains and close all doors to keep this cooling intact for a while. If you don't own heavy curtains, you can also put up a wet sheet near the window. This will ensure any hot air that passes into the cool wind in your room.