Understanding the Benefits of NFRC Certified Windows

  1. Impact window ratings
  2. NFRC ratings for impact windows
  3. Benefits of NFRC certified windows

When it comes to choosing the right windows for your home, it is important to understand the different ratings and certifications that are available. The NFRC, or National Fenestration Rating Council, is a non-profit organization that provides certification for windows based on their energy efficiency and other performance criteria. Understanding the benefits of NFRC certified windows can help you make an informed decision when selecting the best windows for your home. NFRC certified windows are designed to provide superior performance when it comes to energy efficiency and security.

They have been tested and rated based on a variety of criteria, including thermal insulation, air leakage, water penetration, structural integrity, and more. The ratings provide a comprehensive evaluation of a window's overall performance and can help you decide which type of window is best for your needs. NFRC certification is a rating system developed by the National Fenestration Rating Council (NFRC) to determine the energy efficiency of windows and doors. The NFRC ratings are a measure of a window's ability to limit the amount of heat transfer into or out of a building, as well as the amount of visible light that can pass through. The ratings are based on a range of factors, including U-factor, Solar Heat Gain Coefficient (SHGC), Visible Transmittance (VT), and Air Leakage (AL).

U-factor measures the rate of heat transfer through the window and is expressed in terms of the rate of heat loss or gain. The lower the U-factor, the more efficient the window will be at insulating against heat transfer.


measures the amount of solar energy that passes through a window, and is expressed as a number between 0 and 1.The lower the SHGC, the less solar heat that will enter a building.


measures the amount of visible light that passes through a window, and is expressed as a number between 0 and 1.The higher the VT, the more light that will pass through the window.

AL measures how much air is leaking through a window, and is expressed in terms of cubic feet per minute per square foot. The lower the AL, the less air leakage there will be. Having NFRC-certified windows installed in your home can provide a variety of benefits. For starters, having windows with good ratings can help reduce energy costs by reducing the amount of heat transferred into or out of your home.

Additionally, good ratings can help improve comfort in your home by reducing drafts and keeping temperatures more consistent. Finally, having windows with higher VT ratings can allow more natural light into your home, reducing your need for artificial lighting. Identifying NFRC-certified windows is relatively simple. All NFRC-certified windows will have a label showing their ratings for U-factor, SHGC, VT, and AL.

Additionally, each window will have its own unique certification number which can be used to look up its ratings on the NFRC website. It's important to note that not all windows are NFRC-certified, so it's important to make sure you check for this label before making any purchases.

How to Identify an NFRC-Certified Window

When looking for an NFRC-certified window, there are two main ways to identify it: by looking for the NFRC label or by looking for an Energy Star label. The NFRC label can be found on the window itself, usually near the edge or corner. The label should have the words “NFRC Certified” or “NFRC Rated” printed clearly.

If the window does not have an NFRC label, it is likely not certified. An Energy Star label can also indicate that a window is NFRC certified. The Energy Star label should be printed on the window itself and will have the words “ENERGY STAR Certified” printed clearly. This indicates that the window has been tested and certified by the NFRC.

If you are uncertain whether a window is NFRC certified, you can contact the manufacturer or installer for more information. They should be able to provide you with proof of certification if it is present.

What is NFRC Certification?

The National Fenestration Rating Council (NFRC) is a non-profit organization that evaluates, certifies, and labels windows, doors, and skylights for their energy efficiency. NFRC certification is a voluntary program and is designed to help customers understand the performance characteristics of their windows and make informed decisions about the products they purchase.

NFRC-certified windows are rated in four categories: U-factor, Solar Heat Gain Coefficient (SHGC), Visible Transmittance (VT), and Air Leakage. The U-factor measures how well a window keeps heat inside the home during cold weather. SHGC measures how much solar radiation is allowed into the home during hot weather. VT measures how much visible light is allowed to pass through the window.

Air leakage measures how much air passes through the window. Having NFRC-certified windows can help improve energy efficiency in homes. By understanding the performance ratings of their windows, homeowners can make better decisions about what type of windows to purchase. Additionally, NFRC-certified windows may qualify for certain tax credits or incentives from local and federal governments.

Factors Considered for Window Ratings

The National Fenestration Rating Council (NFRC) provides ratings on windows and doors based on several factors that are important in determining the energy performance of a window.

These factors include U-factor, Solar Heat Gain Coefficient (SHGC), Visible Transmittance (VT) and Air Leakage. U-factor measures how much heat is transferred through a window, and is often referred to as the “R-value” of a window. The lower the U-factor, the better the window is at trapping heat. The SHGC measures how much solar heat is blocked by the window.

A lower SHGC rating indicates that less heat is being blocked from entering the room. Visible Transmittance, or VT, measures how much light passes through the window. This can be important if you are looking to maximize natural light in your home. Finally, Air Leakage measures the amount of air that can pass through a window.

The lower the air leakage rating, the more airtight your windows will be. In conclusion, NFRC-certified windows can offer a wide range of benefits. From improving energy efficiency to providing added protection from the elements, these windows are a great choice for any homeowner. They are subjected to rigorous tests to ensure that they meet industry standards and can even qualify for energy efficiency tax credits. When shopping for new windows, be sure to look for the NFRC label or Energy Star label to guarantee you are getting the best product available.

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