A ceiling fan

A ceiling fan is a fan suspended from the ceiling of a room. It sometimes has a light incorporated into it to replace any displaced light or to provide additional light. These devices are used in two ways: to create a breeze for an apparent cooling effect ("wind chill"), or to force warm air near the ceiling downward to the occupied part of the room. Ceiling fans can reduce heating costs by reducing the load on heating equipment, and they can reduce cooling costs by making warmer air comfortable. Wikipedia