Ceiling fans can be a good stand alone option for keeping your room cool, or they can work in conjunction with an air conditioning system to help circulate conditioned air through the room. If you use the two together it is possible to turn the air conditioning off once the room is cool and let the fan do the work to keep it that way. This is a great cost saving measure not only in terms of your power bill but also in that it reduces the wear and tear on your air conditioner or heating system.
Additionally, ceiling fans have two modes – one for winter and one for summer. There is a switch that sits above the fan blades that controls this. The winter mode reverses the direction of rotation to anti clockwise, and due to the angle of the blades, sucks the air from the lower part of the room upwards therefore pushing the upper air down. Since hot air rises, the air that is being pushed down is necessarily warmer than the rest of the room. This improves the heat distribution in the room allowing you to set your heating system to a lower level and or use it for less time.