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The company changed its name to Pella Corporation in 1992. [3] [4] [5] Pella Corporation has around 10,000 employees nationwide and 20 manufacturing sites throughout the United States and select regions of Canada. Pella's most notable brand of windows includes the EnduraClad and EnduraGuard systems. [6]
A typical installation of insulated glass windows with uPVC frames. Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50 °C, indicating how the concept may have started: [2]
When compared to traditional double-pane or triple-pane windows with mechanical or structural shading arrangements, multipane glazing enables easier viewing between indoor and outdoor environments. A low U-value maintains inside glass temperatures at a more uniform level throughout the year.
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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. [8]
However, the additional manufacturing step adds to the cost of production, and the coating will degrade when exposed to the elements, and so can only be placed on the inside faces of a double-paned window. Generally, solar control Low-E windows are soft coat and passive Low-E windows are hard coat due to the lower emissivity of the soft coat.
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