All mine are in the basement, cold in the winter and cold in the summer because of my Ac unit.
I don't have many with the electronics but if I did I would do like you do. For peace of mind.

If I was in Florida (which I would never live, I hate jungle weather) I would make sure my garage is well insulated with an AC unit.
For sure!
Last year I had my central AC and heater unit replaced.
Close to 10k but well worth the money, I am saving on electric and gas big time now.
Plus I had rebates and tax write offs that totaled close to 2k.
So it was 8k well spent.
My garage is the same as yours, last year (summer) I painted the inside in the 90* weather.
I bought a big fan and installed it on a TV wall mount, I can direct the air with the swivel mount to any part of the garage.
It comes off easy to use on the floor if needed.
Having air blow on me kept me sort of cool while painting, matter of fact I will take it off and use it outside while working on my pickup truck or car.