I've got a smallish swamp cooler I use when the air is dry I stick outside the one of the coop windows and let it run till it cools down. When it doesn't cool down I run it 24/7. When it gets real humid I just run the fan. Around noon I start up the sprinkler and move from place to place. I also don't cut my grass to low it holds water and helps cool the ground and I do let them out all day. Enjoy
They sound spoiled.. Have you ever tried the omega-3 seed blend? A few of us went in on some of that seed, & boy do they love it.
We fence off a portion of the yard to let it grow. Then once it is established we let them loose on it..