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Question DetailsAsked on 4/14/2018

which patio door has the lowest NFRC rating.

I am living in the Northeast and wish to replace my sliding glass doors circa 1974 because they are such an energy loss 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?

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Usually the argon gas fill should be around 90 percent this reduces the chance of a blow out on extremly hot days. We at (Tri-Pane Installations) use patio doors with a .26 u factor. The advanced seals technology offers the customer a warranty against seal failure. we cover that because the design should not allow the gases to escape. Not all windows and doors are made that way. The lower the u.value the better the insulation, you also want to look at condensation resistance numbers, there the higher number is better.

Answered 2 years ago by the new window man

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