Well you know from reading Vanabode that the right way to escape this issue is to not fight it at all. Reread the weather chapter again for how I do it. Meantime I suggest the following if you are staying put for now.
Reduce your debt and overhead as explained in the book so that you can leave the second job altogether and travel at will not needing that second income. Then you can go (and work if you want to) in places that are cooler in the summer.
If you MUST stay in Florida for now year round or choose to for reasons not explained in your email, I would consider these strategies. First, find someone who has a house and pay them $100 a month to park in their yard and plug in a portable small AC unit you can buy from Walmart for about $130. OR stay at one of the many cheaper rv parks around for the hot months of May to August and plug in there.
If you are "working from home on your insurance business" you can hang at one of the many great libraries in Brevard County and reclaim some of the taxes you have paid all your life into the "system" by enjoying the AC all day for free.
Truckers use a special 12 volt cooling system that MIGHT (I have never tired it) work. see it here - http://www.swampy.net
SOME people claim that you can buy a bag of ice ($2) put it in a plastic tub next to the bed and use a 12 volt fan to blow air across it as you sleep to cool you down. I have not personally done this as I do not stay in muggy states during summer. Sleep is a VERY important element of the Essentials of a Great Life as explained in the book in detail, and so I make sure I am comfortable year round.