See the link. You'll want a little ventilation and should not run it when you are sleeping (take a good quilt or sleeping bag). But for the $ and convenience, you can't beat it. I've used it off watch in 45* weather by just running it for 15 minutes to take the chill out of the cabin (I lash it to the mast at the cabin sole), or at anchor by running it in the morning while the coffee is brewing or in the evening while reading a book. One can, of course, run it more frequently, but a good watch cap is a wonderful help too. And at about $80, it is a bargain solution for your Florida heat problems.

http://www.mrheater.com/product.aspx?catid=41&id=24