I have thought about this one a lot recently. I wrap my vision racks in insulation board from Lowes (the 1" think pink foam stuff). This certainly helps hold heat, but I find that the cable alone is still to weak. As such, I plan to with install 4" heat tape on each row. I will likely have to use the Dremel to remove some plastic, or I could use 12" heat tape and install it on the back of the rack between the insulation and the tubs. I will let you know when I do this and the outcome. The later option sound like the most practical right now.
Warren
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