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With six-pane glazing, a U g value as low as 0.24 W/(m 2 K) [R-value 24] was reported. [1] This brings several advantages, such as: Energy efficient buildings without modulated sun shading The desired overall window thermal transmittance value of lower than about 0.4 W/(m 2 K) is possible without having to depend on modulated external shading.
Energy-efficient houses in cold climates often feature triple-glazed windows with a U-value between 0.19 and 0.26. In moderate and hot climates, quality double-glazed windows with a U-value of about 0.30 are generally a more cost-competitive and effective choice. [6]
Adding argon gas increases the efficiency to about R-3. Using low emissivity glass on surface #2 will add another R-value. Properly designed triple-glazed IGUs with low emissivity coatings on surfaces #2 and #4 and filled with argon gas in the cavities. Certain multi-chambered IG units result in R-values as high as R-24.
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Pella Corporation earned an ENERGY STAR Partner of the Year 2013 award, presented by the U.S. Environmental Protection Agency (EPA) and the Department of Energy (DOE) for manufacturing energy-efficient windows and educating consumers about them. [8] Pella has been an Energy Star partner since 1999. [8]
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