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 2001 more stringent residential code requirements went into effect with the adoption of International Residential Code (IRC) as the statewide residential building energy 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