We use fans for indoor locked chickens. I myself like to allow my flock to wander during the hotest hours. They tend to prefer tree shade, and nice dirt baths. I'm not above trimming feathers, as it is often over 105 here in the summer, for 2-3 monthes (it does just only get into the upper 90s somedays), and its very humid. If you have no breeze, I'd use a nice box fan, and offer them cool water around 2 pm, when the heat is getting maxed.
If your in a building, consider spraying the roof with water, or setting straw on the top, to insulate from the suns baking effect. Old blankets taked on roofs for the summer and soaked at noon work nicely also.
Good luck!