[BLDG-SIM] need insulating Al windows

[Dan Johnson]

Has anyone come across a storefront system or other aluminum windows
that have a whole-window U value below 0.4 BTU/hr deg F?  The only
alum-framed windows I've been able to find for residential use are
U=0.75 or worse. Thanks in advance.

Dan Johnson
danjoh99 at gmail.com


 
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