Radient Barriers have been available on Villages homes for a long time as an option. My house was built in 2006 and has it. They do save energy cost. Not as much as good attic insulation, but does help.
I have been doing experiments and tests with garage insulation and have finally achieved a cooler in summer warmer in winter garage. I added 12 inches of insulation above, insulated doors, ceiling fans, and changed the lighting. Still got a few more tweaks but am almost there.
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