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They buy the cheaper units without dual pane then try to sell from the lot.
I have single pane and have RVed in the cold and the heat - We rarely end up in the right climate to just open windows so our interior uses climate control A LOT. Next time it's dual pane because the weight difference is too small to worry about and the cost is returned from using less propane or less wear and tear on the A/Cs. This is a no-brainer. I wish I had thought about these BEFORE we bought our Monty.
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