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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.
Double-paned windows are the norm in new residential installations, as they offer substantial energy savings in comparison to single-paned glass. Each individual glass pane has poor insulation properties, with an R-value (insulation), or measure of an object's resistance to heat conduction, of 0.9. However, when two panes are placed in series ...
Modern double-pane and triple-pane windows often include one or more low-e coatings to reduce the window's U-factor (its insulation value, specifically its rate of heat loss). In general, soft-coat low-e coatings tend to result in a lower solar heat gain coefficient (SHGC) than hard-coat low-e coatings.
“The sophistication of double-pane energy-efficient windows wasn’t ubiquitous when a lot of the malls were built in America during and after the 1970s energy crisis.
Single glass windows are no longer in general use. [4] The insulation provided by double or triple glazing can be further improved by selecting windows with low-e coatings, thermal breaks and argon or other similar gas between the panes, and also by selecting windows with high energy-efficient frames.
Sep. 27—JAMESTOWN — Storm windows help prevent any air infiltration in homes with older, single-pane glass windows, according to Clyde Schmautz, manager of Infinity Building Services.
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