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The NFRC has developed a window energy rating system based on whole product performance.
U-factor measures how well a product prevents heat from escaping.
The solar heat gain coefficient (SHGC) for your window may be found on the National Fenestration Rating Council (NFRC) label affixed by the window manufacturer prior to sale.
You can think of the building envelope as the boundary separating the inside from the outside and through which heat is transferred.
High performance windows (83 KB)
Windows typically compromise 10 to 25 percent of the exterior wall area of new homes.
The Building Envelopes Program at Oak Ridge National Laboratory (ORNL) is a program within the Buildings Technology Center (BTC), the premier U.S. research facility devoted to developing technologies ...
This article is based on questions regarding Building Envelopes asked during the May REScheck Webcast as well as questions received through email.
Window Primer (32 KB)In winter, much of a home's heat escapes through drafty, poorly insulated windows. In summer, unshaded windows can cause over 40% of a home's air conditioning costs.
It is difficult to completely eliminate moisture on existing windows. Inefficient windows (e.g., single pane with aluminum frames) or high moisture with inadequate ventilation can result in condensati...
This article is based on Building Envelope questions asked during the August 18, 2005 COMcheck Web-based training session as well as questions received through email.