When extreme temperatures arise, I freeze pieces of fruit in a block of ice. As it melts, they get a cold treat, and very cold water to drink up. That and a powerful fan works well. If it's very humid where you're at, try not to overuse the mister. If the ground of the run gets saturated, it'll be a breeding ground for bacteria. The misters work great in dry climates. If it's humid where you're at, you could run it until late afternoon, then cut it off so there's enough daylight to dry out the run.