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In 1992, Pella entered the national retail market with windows and patio doors, adding select lumberyard distribution in 1994. In 2001, Pella introduced Pella Design Centers to mainstream market customers, as a “ store-within-a-store inside Lowe's stores and staffed by Lowe's employees.
Fitting a second pane of glass to improve insulation began in Scotland, Germany, and Switzerland in the 1870s. [3] Insulating glass is an evolution from older technologies known as double-hung windows and storm windows. Traditional double-hung windows used a single pane of glass to separate the interior and exterior spaces.
Researchers found that on average, quad-pane windows saved 24% heating and cooling energy compared with a high-performing double- pane window. For new construction and window replacements, the quad-pane windows have payback between one and six years, depending on climate zone and utility rates. [12]
Especially when combined with double-or-triple-paned windows, the R-values achieved with low-e coatings can be quite high, with a 3-paned window filled with argon with one low-e coating having an R-value of 5.4. [10]
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]
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]
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