Source: http://www.thriftyfun.com/tf443496.tip.html

What is a Double-Pane or Glazed Window?

A type of window having two layers (panes or glazing) of glass separated by an air space. Each layer of glass and surrounding air space reradiates and traps some of the heat that passes through thereby increasing the windows resistance to heat loss (R-value).

U.S. Department of Energy

Source: http://www.thriftyfun.com/tf443496.tip.html

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