Oh awesome! Sounds like you're doing a great job for them. They're lucky to have you!Thanks so much, Tookie!
My mom and sister made some frozen treats for them! The chickens have a kiddie pool of water to wade in. We also take frozen water bottles out to cool their drinking water. And recently, we set up some tarps to provide even more shade.
Hopefully, they should have enough ventilation in the coop. We have a large window that I open wide in the summer. They have a solar powered fan that blows air out of the coop during daytime. And my dad built the coop so that the roofs eaves allow air out. Here's a picture of them when they were little at the window:
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