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Back when I owned a smaller class C motor home I had storm windows made for all the windows in the coach, they could be taken out in the summer and were held in place with holders that mounted on the frame and you twisted them over the storm window to hole them in place, they worked very well as I used this unit for many hunting trips in temperatures in the -30 degree range, they did not accumulate moisture but certainly added to the comfort in the unit.
We ordered our current Montana with the thermal windows, while the airspace is only about 3/8" and does not provide a great deal of insulating value they do help, we have had them on our last 3 units and I would order them again if I were ever to buy a new unit.
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