In Florida I would not build a box type coop. Much too hot there. What they need is shade, shelter from rain -- and plenty of breeze. Chickens will tolerate temps well below zero but can die at 100 degrees. It never gets cold enough in Florida to pay any attention to.
If you have a problem with predators, I'd put my money into a rectangle with a top made of welded wire. The people down the street from me have something like this, with nothing for a coop but a piece of plywood laid over part of the top. That's may be a bit much (though not unusual around here) but a three sided shelter is plenty in this climate. My son and DIL built a good size three sided shelter in a day -- maybe 8' X 16'.
Here is a thread with some ideas for this climate:
https://www.backyardchickens.com/t/163417/please-show-me-your-hot-weather-coops
If you have a problem with predators, I'd put my money into a rectangle with a top made of welded wire. The people down the street from me have something like this, with nothing for a coop but a piece of plywood laid over part of the top. That's may be a bit much (though not unusual around here) but a three sided shelter is plenty in this climate. My son and DIL built a good size three sided shelter in a day -- maybe 8' X 16'.
Here is a thread with some ideas for this climate:
https://www.backyardchickens.com/t/163417/please-show-me-your-hot-weather-coops