Author: Green Architect Jeremy Bonin, AIA, LEED AP
Website: http://www.blogger.com/profile/07495457719901726105
What to Look for in Energy Efficient Windows:
In 2005 the National Fenestration Rating Council (NFRC) developed a label to provide consumers with energy performance data on windows, doors, and skylights. This label helps you compare one product to another, listing the manufacturer, a product description, a source for additional information, and ratings on the following energy performance characteristics (windows and doors are rated as whole systems, glazing and frame).
U-Factor: A window’s U-Factor measures how well a unit prevents heat from escaping (the inverse of its R-value). U-Factor ratings are usually between 0.25 and 1.25. The lower the U-value, the greater its ability to resist heat transfer and better insulate the home.
Solar Heat Gain Coefficient (SHGC): The Solar Heat Gain Coefficient rating indicates how well a window, door, or skylight blocks solar heat by measuring solar radiation released into the home. The lower the coefficient value, the less solar heat is… (Read the rest of this article at the following article source link for the full story)
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