According to a Kolbe press release,
These windows achieve energy performance ratings that put them in the top tier in the industry with U-Values of 0.18/.19 and R-values of over 5, along with Solar Heat Gain Coefficient of .23. These insulating values are nearly twice as good as those currently required by Energy Star. Our units allow for a maximum air infiltration of only .01 cubic foot per minute, which is 30 times better than the industry standard.
Windquest EP windows come standard with a special combination of high-performance LoE coatings on the glass to optimize U-value, visible transmittance, solar heat gain coefficient, and external appearance.
In an interesting marketing note, I see that Kolbe is pushing this news on its Facebook page.
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