I am in Florida also and we are now getting temps that are well into the mid 90's by afternoon. During the day the coop is just too hot. The only solutions that I have found are, one, that I have a covered run that is open. Once it starts to get hot I turn on a mist system that operates in about 1/3 of the run and at mid day when it gets very hot they do like to be near the mist as it drops the temps at least 10 degrees. I also have a ceiling fan in the run that does circulate the air and also speads the mist around. I have a shallow pan that I fill with cold water that can can step in which also seems to cool them a bit. Most importantly you need to make sure that they have a constant source of cool water at all times. During the afternoons I will usually cut a quater watermelon and put that in their run. They love it and it provides them with water. If yours are confined to their coop during the days then it will be very hard to create something that will keep them cool enough when the temps hit the high 90's.