Between these two, it is quite obvious that an air cooler provides much better cooling than a fan because it actually emits out cool air and not just circulate the air around. Also, while a fan covers a limited area of the room, air cooler uniformly distributes the cool air all over the room. Air cooling is a method of dissipating heat. It works by expanding the surface area or increasing the flow of air over the object to be cooled, or both. An example of the former is to add cooling fins to the surface of the object, either by making them integral or by attaching them tightly to the object's surface.