Most box fans use between 50-100 watts of power per hour, according to experts, who say a 20-inch box fan consumes about 50-75 watts per hour.

So I ordered this simple box fan and put it in front of the treadmill, cranked to max speed. My Little Treadmill Lifesaver. Amazon Basics 3-Speed, 20-Inch Box Fan. $32 at Amazon.

Most box fans use between 50-100 watts of power per hour, according to experts, who say a 20-inch box fan consumes about 50-75 watts per hour.

Most box fans use between 50-100 watts of power per hour, according to experts, who say a 20-inch box fan consumes about 50-75 watts per hour.

So in our box fan example from above, the formula would be: (50 watts x 24 hours) / 1,000 x $0.17 per kilowatt-hour = $0.20.

Most box fans use between 50-100 watts of power per hour, according to experts, who say a 20-inch box fan consumes about 50-75 watts per hour. That's about 50% more than your standard ceiling fan, but ...

Most box fans use between 50-100 watts of power per hour, according to experts, who say a 20-inch box fan consumes about 50-75 watts per hour.