When selecting window products for a client, builders and architects must be sensitive to both the requirements laid out by state and local building energy codes and the window preferences of the customer.
In 2009 more stringent residential code requirements went into effect with the updated International Energy Conservation Code (IECC), which was enacted into law in Texas in 2010. The updated IECC provides greater energy savings than the previous requirements mandated by the 2001 IECC and International Residential Code. The IRC also incorporates the entire International Energy Conservation Code (IECC) as an alternative energy code for homes with glazing areas of 15% and below.
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The National Fenestration Rating Council (NFRC) is an international coalition that administers testing, certification and labeling of windows, skylights and doors. NFRC sets energy test standards, administers ratings by independent labs and provides builders, retailers and consumers reliably compare one product to another through the NFRC energy performance label.
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For an excellent overview of Selecting Energy Efficient Windows in Texas, consult the Efficient Window Collaborative's Texas Factsheet or try out their Window Selection Tool