U.S. Department of Energy Energy Efficiency & Renewable Energy U.S. Department of Energy Energy Efficiency & Renewable Energy

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This series of videos explains everything from basic types of windows, to the physics associated with cold and warm weather window performance.
These lecture notes provide information about how weather barriers are different than vapor barriers.
This image shows some of the more complex window componetns of a double pane window.
Embedded thumbnail for Window U-Value Calculation
Source: Passive House Academy New Zealand - published July 1, 2016
Author: Dr. Kara Rosemeier
This video describes how window U-value is calculated.

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