by 
The Curious Bag
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<h4 class="dechead">On One Hand: They're More Efficient than Air Conditioners
Most box fans or floor fans use approximately 100 watts, which adds up to 74 kilowatt hours per month if they're left running around the clock. A medium-sized window air conditioner, meanwhile, uses 900 watts, or 670 kilowatt hours if left on for a month straight. If you're paying $0.10 per kWh for electricity, the cost of running the window unit for the month would be about $67, as opposed to $7.40 for the box fan.
On the Other: Ceiling Fans Are More Efficient
A 36-inch ceiling fan uses about 55 watts when running on high. If left on for a month, the ceiling fan would account for roughly 41 kWh, or $4.10 at the rate previously quoted. Therefore, the ceiling fan offers noticeable savings over the box fan in the long run.
Bottom Line
While it's not quite as efficient as a ceiling fan, a box fan consumes far less electricity than central air conditioning or a window unit. If it provides enough cooling for you, using a box fan instead of air conditioning is a huge energy-saver and will save you a considerable amount of money, comparatively, fairly quickly.
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