Spray the coops down with water from the hose for a little while. I give mine a good soaking, so that when I put my upper torso in, I can tell the before and after temps. Also, I freeze water in milk jugs, bungee cord them to the cross beams, or tie them in store plastic bags so they hang from the ceiling near enough where the birds are to help keep it cooler on those nights when its still in the 80s... Spray the run down... Spray the trees/bushes they like to hang out in down with water... If you have ever walked in the woods after a good soaking on a very hot day, you'll feel the difference... same thing with those shrubs they like to chill out in. Use an old sled, and fill it with cold water. They'll stand in it, or drink it, or both for that matter. Mine do both. Frozen 20oz bottles stuck in the waterer, chilled watermelon, or grapes if they are on sale... frozen fruit...
Now the reason for the fan on a hot day for wind is that the birds will stand in or near the wind path with there wings kind lifted... Someone, I don't remember who said they didn't know why a fan made a difference... well that is it... They lift the wings away from the body to cool themselves... The fan on a windless day helps.
Don't give electrolytes unless the bird is in distress. They should have plenty of their salt needs met already with their layer/flock raiser feed. Plenty of fresh cool water, plenty of shade to hunker down in, a fan if necessary... Poultry drench will work wonders for a bird in distress.