Generally speaking, wall-mounted fans use more electricity than ceiling-mounted fans and more electricity than box fans. However, if you have a lot of horses in your barn, it may be necessary to use several wall-mounted fans in order to create enough airflow to keep them cool.
The average wall-mounted horse barn fan uses about 23.88 kilowatt hours of electricity per month, but this varies depending on the size of the horse barn, whether the barn is insulated or not, the number of horse's being kept inside, and the number of fans installed.