Costs a bit to start, but I carpeted my whole run with a deep layer of mulch. I hose it down about 3 times a day to keep it cool. The chickens scratch themselves a hole and lay in it.I will post up some pictures see if there is something can be done. One of my biggest issue is to keep drinking water cool. I use a 1 gallon jar with poultry nipples even in the shade it gets warm.