Principals of using ceiling fans in warm weather
Ceiling fans move air. Humans (and our pets) reduce their body temperature through perspiration on the skin. By moving air over the skin our body’s cooling mechanism becomes more efficient and we cool down faster. Unlike air conditioning the fan does not cool the air.
If you have air conditioning using a ceiling fan in combination with the A/C means that cool air is distributed around the room. Using a ceiling fan often means that A/C units can be operated on a lower (and quieter) setting thereby making sleep easier and saving energy.