I live in South Florida, specifically... growing zone 10b (for you Roger Cook fans). I'm very interested in enhancing the efficiency of my home, and improving the conditions of the garage. Unlike most other homes in the US, it stays relatively warm throughout most of the year in South Florida. In the winter time, we basically open our windows... most homes don't even have heat. In any case, I wanted to know if there is any benefit to insulating my attached 2-car garage. In the summer, the garage is insanely hot. I figured maybe the garage needed better ventilation, so I opened the attic door, and all that did was make the garage even hotter. I understand the benefits of retaining heat during the winter for homes that are north of Florida, but is there any benefit to insulating to keep the heat out? My garage door is new and well sealed, but I was thinking of possibly using the expanding foam on the inside of the aluminum doors pockets, and sealing it off. I also thought about replacing the side door of the garage to the outside as well.
If I do insulate the garage, can I expect the garage to remain cooler through most of the day, and possibly even help keep the rest of the house somewhat cooler?
(Some obligatory pictures of my garage, note, those massive beams on the garage doors are required to meet Miami-Dade hurricane code)