Running that AC can cost you a pretty penny, but you still need to cool down at night so you can sleep comfortably. Real Simple notes that a fan blowing air out of your room is better than one blowing in.
When your fan is facing out the window, it blows hot air out of the room, which his replaced by cold air from outside. As the cold air comes in, the temperature will drop. It's best if you have another window to open elsewhere so you can get a cross draft going too.
Keep in mind this only works at times when the outside air is actually cooler than the air inside, otherwise you'll want the fan blowing directly at you. The summer heat can get to the best of us, but there are plenty of ways you can tackle it without the use of AC. Don't let the heat burn up your cash too!
A Cool Trick to Beat the Heat | Real Simple via Apartment Therapy
Photo by fauxto_digit.