The paint should be formulated for Florida, containing fungicide to ward off mold and mildew. You guys have special problems down there with the heat and humidity. He said homeowners should consider a semi-gloss satin paint, rather than flat, as it's easier to scrub off mildew from satin. However, if there's already oil-based paint on the house, stick to the same thing unless you strip the surface bare. Water-based paints don't adhere well to oil.
Proper preparation is more than half the battle.
If paint is cracked or peeling, it needs to be scraped or stripped. Any surface that is not stripped should be washed with a 50-50 mix of water and bleach to get rid of mildew, Tower said. Then clean with a high-pressure water gun. Before painting, coat house with a sealer designed to take care of any remaining chalk. Home Spot is provided for your personal, non-commercial use.