My 2 broodies are in the nesting box in the hoop coop. Its the only coop I have. I just roll up the sides a few feet from spring till late fall. I also have the window in the door open as well as one side of the ends. While it can be warmer in there some days when there is a breeze its nice & cool in there. I haven't seen the broody girls panting yet and its been close to 77 in the hoop coop.
I did put a temporary nest in tho because the rest of the hens were climbing over the broodies to lay their eggs and 2 hatching eggs were broken. It took them about 3 days to start laying in the temporary nest. Edie took a week. The broodie girls are getting crankier as the time gets closer for the eggs to hatch.