I'm still trying to "clutter" my run so they'll use the other half but so far, these are some of the things I do.
My battery operated fans have been a huge help!
Misters are their favorite when it's over 100.
I keep jugs of water in the fridge as I don't have much freezer space to freeze a whole lot.
I have solar fairy lights in both coops that are pretty dim but give them a smidge of light(they freak in pitch black).
solar motion lights mounted to the front on both coops that also put off plenty of light in the coop if I have to open the doors and walk in after dark, plus one facing off the house at their coops.
Mine like to play on bales of hay and they use it as a wind block.
Refuse to use their swing(not surprised)
Oddly, I bought a squeaky dog toy and tossed it out for giggles, I occasionally catch one jumping on it to make it squeak.
We are also lacking in bugs here aside from all these darned ants, so I occasionally grab some crickets for them to chase, they LOVE it.
Some are pickier than others but all mine have agreed they love frozen blueberries and watermelon.
This is just a start for me, I'm still very much learning as I go. All mine range from 4 1/2 months, 2 1/2 months, 3 weeks, and I added 2 older girls Wednesday, 2 year old Dominique and a 3 year old silkied serama.