
Highly insulating triple-pane windows keep a house snug and cozy, but it takes two decades or more for the windows to pay off financially based on utility-bill savings ...
http://www.sciencedaily.com/releases/2013/12/131204090838.ht

Highly insulating triple-pane windows keep a house snug and cozy, but it takes two decades or more for the windows to pay off financially based on utility-bill savings ...
http://www.sciencedaily.com/releases/2013/12/131204090838.ht
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