Discover NFRC: The National Fenestration Rating Council

Causes, Prevention, and Solutions

National Fenestration Rating Council

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In the world of windows, doors, and skylights, the National Fenestration Rating Council (NFRC) stands as a beacon of energy efficiency and informed decision-making. This non-profit organization, established in 1989, has played a pivotal role in shaping the industry by developing standardized energy performance ratings and providing consumers with clear and reliable information.

Prior to the NFRC’s inception, the fenestration industry was plagued by a lack of consistency in energy performance ratings. Each manufacturer employed their own methods, often leading to misleading claims and confusion among consumers. This lack of standardization made it difficult to compare products and make informed purchasing decisions.

In response to this growing concern, the NFRC emerged as a unifying force, bringing together window, door, and skylight manufacturers, suppliers, code officials, researchers, and government agencies. With shared expertise and a common goal, the NFRC embarked on a mission to establish objective, standardized energy performance ratings that would serve as a benchmark for the entire industry.

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The NFRC Label: A Window to Energy Efficiency


Measures the rate at which heat flows through a product. Lower U-factors indicate better insulation.

Solar Heat Gain Coefficient (SHGC)

Measures how much solar heat a product transmits. Lower SHGC values indicate better protection against heat gain.

Visible Transmittance (VT)

Measures the amount of visible light that passes through a product. Higher VT values indicate greater visibility.

Air Leakage (AL)

Measures the rate at which air leaks through a product. Lower AL values indicate better air sealing.

Condensation Resistance (CR)

Measures a product's ability to resist condensation. Higher CR values indicate better condensation resistance.

Impact on the Industry and Beyond

The NFRC’s standardized ratings have had a profound impact on the fenestration industry. Manufacturers now have a clear benchmark for energy performance, enabling them to develop and market products that meet consumer demands and industry standards. Building codes, tax credits, utility incentives, and ENERGY STAR all rely on NFRC ratings to assess energy efficiency, further solidifying their importance in the decision-making process.

Beyond the industry, consumers have reaped significant benefits from the NFRC’s efforts. With access to clear and reliable information, homeowners and businesses can make informed choices that enhance the energy efficiency, comfort, and livability of their buildings.

Technical FAQs

The NFRC label provides a comprehensive set of energy performance ratings, while the ENERGY STAR label is a pass/fail designation that identifies products that meet specific energy efficiency criteria.

You can find NFRC-certified products through the NFRC Certified Product Directory, a searchable database that includes information on a wide range of windows, doors, and skylights.

Persistent or excessive condensation, especially accompanied by mold growth or structural damage, is a sign that the underlying issue needs to be addressed. Consider consulting a professional to identify and resolve any underlying structural or ventilation problems.

The NFRC website provides a wealth of information about the organization, its mission, and its activities. You can also contact the NFRC directly with any questions or inquiries.

The NFRC is committed to continuous improvement, constantly evaluating and updating its standards and ratings to reflect the latest advancements in energy efficiency technology. The organization actively engages with industry stakeholders and government agencies to ensure its programs remain relevant and effective.


The NFRC has played a pivotal role in shaping the fenestration industry, transforming it from a landscape of fragmented energy performance claims to one of standardized ratings and informed consumer choices. As the organization continues to evolve, its commitment to energy efficiency and consumer empowerment remains steadfast, ensuring that windows, doors(Door replacement in Greenville NC), and skylights continue to contribute to a more sustainable and comfortable built environment.

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