I've been here over 10 years and have had numerous friends move here over varying times so I have seen and heard a lot of discussions about insulating garages. All the more recently moved people are concerned about their garage temperatures but it seems as time goes on, people think less and less about it and their ability to control it. I would suggest you do nothing, as nothing seems to work that effectively and as time goes on, you will find a hot garage is really just part of living in TV and is not that big of a deal.
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"I am a great believer in luck, and I find that the harder I work, the more I have of it." -Thomas Jefferson
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