Our summers aren't as hot as Florida so just giving them shade and plenty of water is usually fine. I have used frozen bottles a few times on really hot days.
Our hutches have removable wooden walls that I put up in winter to block the wind. The rabbit tractors have a section that is covered. This protects them from wind and rain during winter and gives some shade in the summer.
RE: Caring for our Rabbits on the Homestead....