Yes, ceiling fans can help save energy—but only in the summer.
A ceiling fan during hot, sticky days creates a wind chill effect that will make you feel more comfortable in your home, even if it's also cooled by natural ventilation or air conditioning. If you use air conditioning, a ceiling fan will allow you to raise the thermostat setting about 4 degrees with no reduction in comfort. In temperate climates, or during moderately hot weather, ceiling fans may allow you to avoid using your air conditioner altogether. A ceiling fan is recommended in each room that needs to be cooled during hot weather. Ceiling fans should be turned off when you leave a room; fans cool people, not rooms, through the wind chill effect.