From some article:
The cooling effect of a ceiling fan can make a room feel up to 10 degrees cooler. So, if you have your ceiling fan running, and then crank up your air conditioning thermostat 5 degrees to 7 degrees, you would still be just as cool and comfortable. And for each degree that you raise your thermostat, you save 7 percent to 10 percent on cooling costs.
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Ceiling fans are also extremely efficient, consuming 90 % less energy than air conditioning. A ceiling fan uses about as much energy as a 100-watt light bulb, so it costs just pennies a day to operate. When you compare this to more than 50cts per hour for air conditioning, you can see how the savings begin to add up. In fact, studies show that ceiling fans can save you up to 25 to 40 percent on your summer cooling costs.
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