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Agree. dual pane windows do more for sound dampening than they do for thermal protection. They are NOT thermal windows, as they are not sealed and filled with gas between them like residential thermal windows are. Actually using something Reflectix over the window in below freezing weather will do more than dual pane windows and be far cheaper.
On that idea, lining the wall of the trailer, on the inside of the cabinets (out of sight so it is not an eyesore), with Reflectix will decrease heating demands considerably. Reflectix is a great insulator that is 2 layers of reflective barrier with a middle portion similar to micro bubble wrap sandwiched between them. Whole thing is a little over 1/4" thick. It is a good idea to line the inside of cabinets, dinette seating, etc on the sides that connect to the trailer wall. Not only is Reflectix good for cold weather, but it is a great reflective barrier insulation for hot weather also. Will reduce your A/C cycling also.
Many 'cold weather packages" that RV OEM's use include products like Reflectix in them. Many OEM's use it to line the enclosed belly of trailers. Some even will use it as supplement to ceiling insulation in their cold weather package. It is a great product. Light, easy to mold and work with, and relatively inexpensive. All major home repair stores carry the stuff.
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