You've got a big advantage if the coop is cooler than outside, because in the Valley, the heat of the day is at roost-time. Yes, I've used a misting bucket top fan, and others have used fans with misters together. Many if not most chickens hate to get wet (mister), so I've replaced several of the misting nozzles with plugs to limit the water. Or, you can aim the mist away from the birds, for example to cool off the wall or create a cool area they can go into to cool off. Putting out a tray of ice cubes is great. My chickens loved to peck at the cubes last year. This year I'm in a less-hot area. But I've had to break out the half filled 2-liter soda bottles already. They'll lay next to them. And the half filled trays with clay bricks, the girls eventually stood on the bricks and realized they could cool off without getting their feet wet. I believe others do cut down the kiddy pools and the chickens wade in them to cool off but I haven't done that.