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There were two reasons that I excluded vinyl from consideration. First, replacement vinyl windows take up much more of the glass area than almost any other type of window, with the most energy efficient models (gas filled triple pain) taking the most area of all. Since I have many tall, narrow windows, this would visually look quite odd. Second, and more importantly, from every report I had, even the "best" vinyl windows made with the highest quality vinyl and filled with expanding foam eventually start breaking seals due to the fact that the thermal expansion coefficients of vinyl and glass differ significantly. Getting such seals repaired and the argon or other inert gas replaced is very expensive, if possible at all. (Just shipping windows manufactured, filled and sealed near sea-level to my 6000+ ft elevation could cause seal problems.)