I brought mine in the house all day and night. My 3, 12 week olds were extremely good and stayed in the kitchen while the 5 smaller ones were in the kennel downstairs. In the heat, they were all on the brooder floor with their necks stretched out, wings away from body panting. I then decided to bring them in. The fan in the coop was just blowing around the hot air.
I filled the water with ice and put a gallon jug ice block in front of the fan. I tried putting them out at night, but it was 95 degrees at 10pm. That's when I brought them back in the house until morning. I have a small flock of 8, so it worked out.
Good luck! I hope it goes okay. This heat is horrible!