When I look at the windows of my 1852-vintage home, for example, I'm less likely to dwell on their lovely thin mullion sash windows than I am to consider the enormous amount of heat that I lose to the frigid air outside, despite my collection of storm windows, deadlights and window quilts.
http://ift.tt/1DMvKNm
http://ift.tt/1DMvKNm
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