I live in FL too. I don't know how you can keep your reptiles in the garage because it gets way too hot in the summer and too cold when we get cold snaps. Our garages are not insulated? With the door open, it can still get pretty hot in the summer. You will have to convert that into a room with A/C to ensure the safety and better control of temps and humidity for your reptiles. No one I know keeps pets of any kind in the garage, not even a dog, just because of how hot it can get in there.
And for the post that asked, no, we do not have any laws pertaining to how we can keep our reptiles, only a list of what you can or cannot keep without registration.