Yes fans are good for the coop! Just make sure not to put them where it could hurt the chickens. I have one that draws the hot air out the window and one that circulates the air. Mine only go in the coop during the day to lay their eggs. It gets so hot here in Arkansas that I bought mine an A/C unit 2 years ago and run it at night while they sleep. They really do come out each morning looking so refreshed and ready to fight another HOT day!!