Each year, the average American household spends $1,500–2,500 on energy bills.

45% of that cost is for heating and cooling. Choosing high-performance windows, doors, and skylights can save you money and keep your home comfortable.
We’re here to show you how >>



What is fenestration, anyway?

Fenestration refers to all things related to windows, doors, and skylights. It originated from the Latin word "fenestra," meaning "opening."

The National Fenestration Rating Council is a non-profit organization that establishes objective window, door, and skylight energy performance ratings to help you compare products and make informed purchase decisions.

Are you a manufacturer?

View guidelines to get your product NFRC certified.

Manufacturer guidelines >>

Shopping Guide

Learn product types, performance basics, and what to look for before you buy.

Energy Performance Label

Understand the difference between energy-efficient products using the NFRC label.

Certified Product Directory

View a list of NFRC-certified products.

What does the NFRC label tell you?

The NFRC label helps you compare between energy-efficient windows, doors, and skylights by providing you with energy performance ratings in multiple categories.

U-Factor measures how well a product can keep heat from escaping from the inside of a room. The lower the number, the better a product is at keeping heat in.

Range: 0.20-1.20

Look for: Low numbers

Visible Transmittance measures how well a product is designed to effectively light your home with daylight, potentially saving you money on artificial lighting. The higher the number, the more natural light is let in.

Range: 0-1

Look for: High numbers

NFRC Window Label

Solar Heat Gain Coefficient measures how well a product can resist unwanted heat gain, which is especially important during summer cooling season. The lower the number, the less you’ll spend on cooling.

Range: 0-1

Look for: Low numbers

Air Leakage measures how much air will enter a room through a product. The lower the number, the fewer drafts you’ll experience.

Range: 0.1-0.3

Look for: Low numbers

Product Description

Description of the door type based on the type of frame, number of glazing layers, spacer type, and gas fill.

Glass Area

Amount of glass in door by area.

NFRC Window Label

U-Factor measures how well a product can keep heat from escaping from the inside of a room. The lower the number, the better a product is at keeping heat in.

Range: 0.20-1.20

Look for: Low numbers

Solar Heat Gain Coefficient measures how well a product can resist unwanted heat gain, which is especially important during summer cooling season. The lower the number, the less you’ll spend on cooling.

Range: 0-1

Look for: Low numbers

ENERGY STAR

How is the NFRC label different than the ENERGY STAR label?

Think of it this way: the ENERGY STAR label tells you that a product is energy-efficient. The NFRC helps you compare between energy-efficient products by giving you independent ratings in several energy performance categories.