Our Big Sky came with the dual pane windows. As stated by others they have different openings than the single pane windows do. We were told the escape window over the desk has to be replaced if it`s opened. It can`t be put back in. The bedroom escape window I would need to check out further to see if it can be opened without losing the window itself. If it can be opened some we sure will do that for more fresh air. We would definitely get the dual pane windows again as they really keep it quiet inside.
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