Well, this thread has kind of morphed to cooling the Garage.....dependant on how much time one spends in the garage, and what direction your garage door faces, I think it is an excellent idea to insulate the garage door. Also, any time you have cooler air constantly flowing into your garage it will keep your garage cooler.
Insulating the garage door cuts down the RADIANT heat build up in your garage. Generally one does not insulate unconditioned spaces, like the garage and the Lanai....but some folks who HAVE insulated their garage ceiling and have even installed radiant heat barriers above the garage have stated they have found their garage much cooler.
It is unfortunate that the builders do not give insulated garage doors as an option, as they do not cost much more than the entry grade Clopay garage doors currently installed. I recently replaced my two garage doors with the top of the line Clopay "sandwich type" door that has steel on both sides with 2" of polyurethane in between, giving me almost a R-20 garage door. This has made my garage much cooler. My home faces southeast.
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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