What is the NFRC Sticker that Comes on a Window?

What is the NFRC Sticker that Comes on a Window?

If you’ve ever shopped for replacement windows, you’ve probably noticed a label on the glass or frame called the NFRC sticker. At first glance, it may look like just another piece of paperwork to peel off and throw away, but it’s actually an important tool that tells you a lot about your window’s performance.

The NFRC, or National Fenestration Rating Council, is an independent organization that tests and certifies the energy performance of windows, doors, and skylights. The NFRC sticker is their official label, and it helps homeowners compare products based on standardized ratings.

What’s on the NFRC Sticker?
The sticker typically lists four main performance ratings:

• U-Factor (or U-Value): How well the window prevents heat from escaping. Lower is better.
• Solar Heat Gain Coefficient (SHGC): How much heat from the sun the window lets in. Lower is better in hot climates, higher can help in cold climates.
• Visible Transmittance (VT): How much natural light passes through the glass. Higher means more daylight.
• Air Leakage (AL): How much air can pass through the window assembly. Lower values mean tighter, more efficient windows.

By looking at these numbers, you can compare one window to another and choose the best fit for your home’s needs.

Why Should You Keep the NFRC Sticker?
Once your new windows are installed, you might be tempted to peel the sticker off immediately. However, there’s a smart reason to keep it—especially if your windows qualify for an energy-efficient tax credit. The NFRC sticker provides the official proof of your window’s performance ratings, which may be required when claiming credits on your taxes. Saving the sticker, or at least taking a photo of it, can make the process much smoother.

The Bottom Line
The NFRC sticker is more than just a label—it’s your guide to understanding how energy-efficient your new windows really are. Take the time to review the ratings before purchase, and be sure to keep the sticker afterward in case you need it for tax savings.