Two windows with similar frames, glass, and thermal designs have similar R-values, but that’s where their similarities end. If you take one window and replace its double-pane with triple-pane glass, its R-value will definitely change. Even changing the insulating gas inside the spaces can have a profound effect on its R-value.
Overall, consumers shouldn’t rely on window values being true. Toronto window replacement contractors like Walker Contracting can guide buyers to the right kind of window for any climate; over the course of several decades, the weather will change. Only time knows whether sunny or rainy days of the future will be better or worse.
http://www.walkercontracting.ca/info-article/toronto-windows-replacement-on-insulation-the-true-value-is-a-myth/
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