If you are still under warrantee, Thor will replace it. The problem with double pane windows in an RV is they are subjected to different altitudes which cause the seals to fail. We had them in our former DP, replaced four or five under warrantee, and when we got rid of it, at least three were failing again. Our Gemini has single pane which I'm just as glad to have. I really can't tell any difference in heat or cold radiation between the double pane and the single, though I know double pane is the better insulator. IMO the reason its imperceptible, is because the majority of heat and cold radiation occurs though those very thin walls, which is something all RV's suffer from.
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