If it doesn’t have the label, it’s not NFRC Certified.
With more than 35 years of expertise, NFRC is the standard-bearer in fenestration performance certification, providing the public with objective data that helps stakeholders make informed decisions about product and building performance. NFRC certification ensures that products are tested using precise, scientifically validated methods, resulting in ratings that are fair, accurate and credible.
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
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
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
Air Leakage measures how much air will enter a room through a product. The lower the number, the fewer drafts you’ll experience.
Range: ≤ 0.3
Look for: Low numbers
NFRC also has a condensation rating that is optional for manufacturers to include, so you may or may not see it on the label. The higher the number, the better a product resists condensation. Download the optional label.
Product Description
Description of the door frame or glass.
Glass Area
Amount of glass in door by area.
Door-specific Rating
The circled value shows you the rating a door has received. Each rating is split into two values: Solar Heat Gain, and U-Factor.
Solar Heat Gain Coefficient measures how well a product can resist unwanted direct or indirect solar radiation. This radiation can cause your home to heat regardless of outside temperature, which may be favorable or unfavorable depending on whether you’re heating or cooling your home. In summer months, a low solar heat gain coefficient helps to keep your home cool. In winter months, a higher solar heat gain coefficient can help to keep your home warm.
Range: 0-1
Look for: Low numbers in cooling conditions; high numbers in heating conditions.
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: 0.00-2.00
Look for: Low numbers
