I recently put Alpen (previously Serious Windows) fiberglass windows in my office and they are amazing (and their price is shocking as well, high not low). But they are very nice. I put in 725 series casement windows in. Their 725 series picture windows have a U value of .15. All windows are custom made so you can get whatever size you want.
Here are their offerings:
Fiberglass Windows | Alpen Windows Alpen Fiberglass Windows | Alpen High Performance Products
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Last edited by Daox; 02-27-14 at 08:12 AM..
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