You may have already discovered by now that hatcheries have a minimum order number of chicks. Usually twenty five. There are some that will let you order fewer but they make up for it by putting "packing peanuts" in, which usually means unwanted male chicks, to keep sufficient warmth in the...
It's not too hot to brood chicks in Florida. You may well need to turn the light/heat off during the hotter parts of the day like I am doing now, but it's not too hot to brood them.
The thing with chicks or older birds is that they need plenty of clean, fresh water, shade, and good air flow...