Window Labels: Missing in Action

September/October 2008
A version of this article appears in the September/October 2008 issue of Home Energy Magazine.
Click here to read more articles about Windows
September 07, 2008
Thermal certification field labeling is simple, and inexpensive, when a knowledgeable representative from the window manufacturer is involved.
Over the last six months, we’ve encountered a number of thermal labeling problems with windows in our HERS ratings. These problems run the gamut from no thermal label at all to a partial label to an improper label. Unfortunately, the most serious problem we’ve encountered is invalid field labeling by a dealer or the manufacturer’s representative who are unfamiliar with proper field labeling procedures. This is a serious problem because ultimately, the whole home certification could be considered compromised when these little-known procedures are circumvented. In reality, field labeling for thermal certification is relatively simple and inexpensive, provided the correct procedure is followed and a knowledgeable representative from the window manufacturer is involved. Window Labeling and the NFRC In the late 1980s, the Federal Trade Commission (FTC) investigated dubious claims of highly efficient windows in Oregon and Washington State. In response, the National Fenestration Rating Council (NFRC) was formed in 1989 to provide independent verification of product performance so that the federal government would not have to develop standards and administer a certification and labeling program for the fenestration industry. The Energy Policy Act of 1992 (EPAct92) recognized the NFRC as the country’s official ...

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