I live in Florida too. Going to build a nice big fermentation chamber this summer, but for now I am going the easy/cheap route. A friend was gonna throw his fridge away (regular size, freezer on top style). I took it, removed all of the shelves and built a very simple wooden platform to bring the bottom of the fridge to a larger, level size.
I took the freezer door off so I don't get mold up there, and take advantage of the space for general garage storage (wife says it is just another place to put "junk").
I can put 2 fermenting buckets in there.
I keep it cool by setting a frozen bottle or 2 of water in with the beer each morning. I watch the temp - if it is creeping up, I use a gallon size jug. If it is trending lower, I use a 22 oz water bottle.
Come summer I might have to alternate between the gallon sized jugs - we'll see. But keeping the temp between 67-70 is no problem at all, and it would be easy to drop it a few degrees.
The only downside is that I have to check it each day.