Our garage gets hotter than the house even with the garage door open so it's not an option for us to put chickens in there.
My DH chose to have chickens so he takes care of them w/me. I fell and broke my arm big bone in May so he took off work to care for me AND the chickens this past month. I type w/ one finger for now.
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I put up 3 popup canopies in the chicken side of the yard and planted pomegranate and lemon trees for chicken's shade. I buried the canopy legs in the ground so they don't blow down in the wind -- the covers tear but the canopy frame stays in place. Then we re-cover the frame top with tarp and giant grip clips every year. The buried canopy frame legs are buried permanently in-ground so not possible to fold up the canopy to put on new expensive fitted canopy covers so we just get cheap tarps and it works well for over 10 years.
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Re-covered canopies with tarps & grip clips
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I made two raised garden beds out of paver stones
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And under one 10'x10' canopy I used a 4'x4' cedar wood raised garden bed to make a sandbox for chickens to dust bath in the shade or have dry sand if it rains.
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Sand box dust bath. Some people use a plastic kiddie swim pool filled with sand in their coop.
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We bought two Orbit Misters from hardware store and it was a waste of money. The small mister holes got clogged from our hard Calif mineral water and the clogging made the couplers leak bad, so we switched to a much cheaper sprinkler we put in the shade of a canopy & ran water real slow all day for chickens in heatwaves. They like the dripping water and stand in the puddles to cool their feet.
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Every owner, every chicken, every environment is different and each of us figures what works best for our chickens. It helps to talk with others to see if any of the ideas can work. For me the misters didn't work while others like them.