I just recently put a 10 space rack together using a plastic shelving unit from Lowes and for some reason the heat is not transferring well to inside of the tubs at all. I will get 90+ degree readings on the heat tape itself, but some of the tubs will be reading low to mid 70’s inside. I just taped the heat tape (with metal tape) directly to the plastic shelves without any panel board or anything under it. The shelves are “perforated”, not solid, etc. Could that be the problem?




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