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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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fiberglass? . . n'no, you want carbon fiber windows.
Seriously, IMO, the design will trump material used.
Every window is a compromise in some way, so just pick what looks right for your balance. ...which has the features you want at the right price. (keep in mind that the energy performance sucks on all - compared to a well insulated wall)
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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