Not sure if this is of help but..... we have the thermo window option in our TT, really happy we have them, never have we experienced any condensation on the window glass, the trailer seems to retain the heat better than our last one did without thermo windows. The openings on ours are on some windows just the bottom section of the window and others slide open side to side. We feel there is lots of air flow while still lots of windo surface to see out of. Our windows are the flat, frameless thermo type.
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