Ceiling fan

A fan suspended from the ceiling of a room is a ceiling fan. It usually has a light associated with it to replace any displaced light. These devices are generally used in homes without central air conditioning, or in conjunction with air conditioning to lower energy bills. Ceiling fan controls usually include one for speed (slow, medium, and fast), one for the light (on and off), and one for directional control of the fan blades (clockwise and counterclockwise). Ceiling fans can be used as a cooling device in warm months (pushing air down, thereby creating a wind chill effect) and a heat transferrer (pulling air up, thereby pushing the heat that stratifies by the ceiling, down along the walls so as not to create a wind chill) in colder months.