"Steve, Adam,
Andre forwarded your question to me, that is why I responded here. Many manufacturers have products that meet U=0.30, since that was the cut-off for the IRS tax credit.
If you are looking for even better windows, you can take a look…"
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christian kohler
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christian kohler replied to Adam Zielinski's discussion Windows: Different Summer and Winter U values?christian kohler replied to Adam Zielinski's discussion Windows: Different Summer and Winter U values?"The winter U-value is what is shown on the NFRC labels, and should be used for code compliance and incentive programs. It is calculated at -18C (about 0F) outside, and 21 C (about 70F), and a roughly 15 mph wind speed. The summer U-value is…"
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