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I just went to look at a job today and the homeowner ran corrugated supply and return piping from the basement to the attic for solar panels. The problem is that they aren't insulated and he is insisting on trying to use them. The run has to be at least 60' long I don't feel comfortable with the uninsulated piping I was just wondering if I am worrying to much about the piping loosing heat. He says the piping is run in the interior walls. What is your opinion? Thanks Derek