Question: how much more electricity does an air conditioner use than a fan?
Answer: a good window AC unit runs on 1.2 kilowatts and costs 14 cents an hour to run. a three-ton central air unit (a common cooling system), runs on about 3 kilowatts and costs about 36 cents an hour to run. a good ceiling fan? It draws only 30 watts to run, costing about 1 cent per three hours of use.