Tom, I have 12 windows in my 3400. If I had all 12 panes setting outside on a pallet, I know I wouldn't be able to lift them. Now, if you DOUBLE that weight...
My back picture window by itself would be a handful - even if it were a single pane. I'm no expert on window glass density/weight, but my general experience tells me that I really don't want to be lifting too much of it. I could be wrong, but I believe there is a substantial difference in the extra weight contributed by dual pane windows.
With that said, however, I would never be without them for the same reasons prevously stated by others here. I love mine.
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