It isn’t a scam but it is also not a must have item. I had Solar Guys install 2 for my house. Wasn’t concerned about ROI. They help keep the house cooler by pulling out some of the hot air. Also had insulation blown in above the lanai and the garage. With that said the garage is some what cooler. Significantly? Probably too strong a word but it does help. When the weather isn’t 90+ degrees, I can definitely notice a difference. (At least a small one anyway.)
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