There are always going to be customers who require increased insulation for severe weather applications.
But to put this whole insulation debate into prospective; the majority of owners are not going to pay for the increased cost and the lose of interior space that a thick insulation is going to require. Remember inches are like feet in a conversion and customers are cramming every inch with something to maximize the living space. Also the majority of owners are not living in these units full-time and many only use them on a occasional basis during the winter months. The standard 30,000 BTU furnace that is supplied in most conversion will cook you out of the thing no matter how cold it is outside and it doesn't cost you that much to run. And on the opposite side of the temp gauge I never had a bit of trouble with (2) 13,500 BTU A/C units cooling my rig down and keeping it that way in 100 plus degree heat, again not costing a whole lot to run.
Bill
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2012 Showhauler 28'6" Motorhome on a Columbia w/ 450 Mercedes.
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