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Think you will find it may have an arched ceiling. Not certain how that may affect the R-value, but my guess would be negative. Having an arched ceiling would allow more heat (in cooler weather) to be higher than down where you want it the heat. I suspect it increases the overall air volume in the unit. That was the big difference I saw at the RV show verus our 2011 3150RL. By the way we do have it for sale.
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