I'm in Scottsdale AZ, and we have routine temps of about 46 C or more in the summer, our heat is dry, so we have a couple of evaporative coolers that run in the day and fans that run at night to keep the air moving since it only drops to about 37 at night. We also have a mister like the one shown in the post above. I put a line of misters around the edge of the run as well that face out from the run and I run them on a timer, 20 minutes every hour or two, it keeps things from getting too wet and humid. I freeze water containers or reuse plastic milk jugs and set them out every day in the worst heat and it allows them to cuddle up to them to get cool. Mine also like cold foot baths, just 18" (45 ish cm) planter trays with cool water in them that I change out every day. I give them vitamins and electrolytes twice per week during the heat, they pant a lot and also poop a lot more wet to get rid of the heat. Here I put ice in their waterers too. It's a bit of a full time job here in the summer, but they are worth it.