The fan is often thought of as the poor man’s air conditioner. But you might want to use a ceiling fan even in rooms that have A/C, and you might want to turn the fan on even in the winter.
On the seasonal flip side, fans can be used to help heat a house:
Most ceiling fans are reversible. During the summer, the blades should move counterclockwise as you look up at the fan, creating a wind chill. In winter months, they should move clockwise. That helps bring the hot air down from the ceiling and even out the heating. Hunter Fan Co. says you can save 15 percent on your winter heating costs by lowering your thermostat 4 degrees and using a ceiling fan.