At a previous house in Sarasota, my wife complained that the garage was too hot and insisted we insulate it. I thought it was a complete waste of money, but compromised and insulated it. I was surprised at how much difference it made. When we bought a courtyard villa here in 2012, one of our first projects was to insulate the garage and the lanai, and we believe both are more comfortable areas as a result. Highly recommend doing both, in spite of not having any hard data to present.
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