Return Air duct insulation

Started by jayd, November 22, 2022, 07:21:18 PM

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I have a residential updraft unit installed in a closet in the garage. The unit is mounted to a raised floor, the area below the unit is where the return air ducts enter. This area has been insulated with 1" duct board, would there be any advantage to adding another layer of 1" for more R value?