I have been forcing my family to drink lots of soda so I can keep the 2 litre bottles to freeze for the chickens! LOL! Right now with our Bi-Polar, Utah weather....It was freezing this weekend, rained all SUnday and SNOWED in the mountains!!! I know....Anyway! I worry about the coop stayig cool cause it is on the side of the house in the sun....but the girls have a lot of "cool" spots to stay during the day, like the cool cement under our porch chairs under the deck, next to the house. I could put a bottle there. Most of our back yard is shaded by our HUGE tree, including the built in swing set/play thing...and 2 girls can fit under the under side of the slide...I think I'll put one there too. And then right under the tree they love to sit around the trunk between the big roots, I can put a couple around there and some in the coop.