The first way to use a fan in the summer is to have it blow air directly on you. This is the most common way to use a fan, and it is very effective at cooling you down. The drawback to this method is that it can be very inefficient if there is not enough wind.
The second way to use a fan in the summer is to have it blow air on your ceiling or walls. This method will help cool down your entire room, and it is very effective at night when the temperature outside is cooler than inside. The third way to use a fan in the summer is to have it blow air on you. This method will cool you down, but it will not help cool down your entire room.