In the summer, run the blades downward to create a cool breeze. If you raise your thermostat by only two degrees and use your ceiling fan, you can lower air conditioning costs by up to 14% over the course of the cooling season. And remember: ceiling fans cool only people, not the room, so when you leave the room, turn the ceiling fan off. Some models now have occupancy sensors in case you forget to do so.
In the winter, your ceiling fan can help improve your comfort. ENERGY STAR certified ceiling fans can be run backward. Running the fan backward at a low speed produces a gentle updraft, which forces warm air near the ceiling down into the living space.