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Ric

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  1. Here is what I did. inside the cabinet of my spa. 1 - Put blue styrofoam panels on the floor. 2- Placed fiberglass insulation with the pink plastic wrapper throughout the inside of cabinet. Had to cut insulation, therefore it did not remain sealed. Made sure to avoid coming too close to motors. 3 - Bought a roll of reflective foil sandwiched bubblewrap type insulation. Stapled that to the frame covering the whole outside of all 4 sides. Reattached redwood sides which sealed up against sandwich foil wrap. I live in NH and like to run hot tub in winter for apres skiing. My cost to run was about $50 per month in winter. IMHO, pretty good. CONS: Over time the insulation picked up some moisture. Insulation also attracted field mice during winter. Not right away but after many years. They build nests and pee and poop in insulation. Not pretty. (If you don't live near nature...you might be ok with this solution.) Accumulated moisture also attracted carpenter ants who ate on corner supporting member. Last summer I removed all insulation and used HT only in summer. I am looking for better ideas than fiberglass insulation. Packaging "popcorn" whether loose or in black trash bags was a thought. I wouldn't mind spraying some expanding foam if I new where to get. The little cans would probably be too expensive, but then maybe not. BTW, I am going to check out the waterproof insulation, but will the mice still nest in it? Hmmmm... Just my experience and hope it helps. Ric
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