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Question DetailsAsked on 4/14/2018

which patio doors have the lowest NFRC rating

I live in the Northeast and am looking to replace my patio doors circa 1974 because they are a huge energy loss. I wish to replace with the best quality. I have heard that argon gas fill is only 80% and leaks out over time despite seals ? is that true? if not which doors/windows don't? Web research only brings me to company sites and long winded sales pitches. I can seem to find independent data.

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