Sales-speak decoder
NFRC label
National Fenestration Rating Council label
The standardized white sticker on a new window listing its independently-tested U-factor, SHGC, and more — so you can compare any two windows on the same terms.
What it means for you
Your apples-to-apples cheat sheet. Ignore brand names and marketing; make every quote show you these numbers.
Where you'll see it
Stuck to the glass of every new window until you peel it off.
Don't be fooled
A salesperson quoting comfort “ratings” without the NFRC numbers is quoting marketing. The label is the receipt.
Defined by Marc Hanley
Verified against NFRC
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