These could be too pricey, but something to think about. From the article:
His frames use four insulating techniques: two types of plastic thermal breaks, air pockets to help prevent condensation and three panes of glass with argon trapped between them. Since these don’t need to be as robust as commercial windows, Gordon uses thinner-walled aluminum, which keeps the price down, and dealing directly with the manufacturer (Gordon) cuts out the standard distributor markup. My total bill is around $55,000.
A simulation of the window design run by an independent testing lab showed that it would be 50 percent more efficient than a vinyl window, with a U-value (a measure of how well it conducts heat) of 0.21, low enough to qualify for an energy tax credit.
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