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The National Fenestration Rating Council (NFRC) is an independent nonprofit organization that provides a credible and transparent method to measure, compare, and promote the energy performance of windows, doors, and skylights. Since its establishment in 1989, the NFRC has played a critical role in advancing the energy efficiency of building products and enabling consumers to make informed decisions when selecting products that save energy and lower their energy bills.

The NFRC energy performance rating system is a comprehensive and standardized approach that evaluates the energy performance of windows, doors, and skylights based on several metrics, including U-factor, solar heat gain coefficient, visible transmittance, air leakage, and condensation resistance. These rating factors are used to calculate the overall energy efficiency of the product, which is expressed on an NFRC label that provides a clear and concise summary of the product's energy performance.

The U-factor measures the rate at which heat is transferred through the window, door, or skylight from the interior to the exterior of the building. The lower the U-factor, the more energy-efficient the product is, as it reduces the amount of heat loss during colder months. The solar heat gain coefficient measures the amount of solar radiation that passes through the glazing and enters the interior of the building, which affects the amount of cooling needed during the summer months. The lower the solar heat gain coefficient, the less solar radiation is transmitted, reducing the cooling load on the air conditioning system. The visible transmittance measures the amount of visible light that passes through the glazing, which affects the amount of natural daylight entering the building.

The air leakage rating measures the amount of air that passes through the product, which affects the energy efficiency, comfort, and indoor air quality of the building. The lower the air leakage rating, the better the product is at reducing unwanted drafts and improving the building's thermal performance. Finally, the condensation resistance rating measures the ability of the product to resist condensation on the interior surface of the glass, which affects the energy efficiency and durability of the product.

The NFRC energy performance rating system has several benefits for consumers, manufacturers, and the environment. For consumers, the NFRC label provides a clear and reliable way to compare products and select the most energy-efficient options that meet their needs and budget. For manufacturers, the NFRC rating system provides a competitive advantage by allowing them to differentiate their products based on energy performance and meet the increasing demand for environmentally friendly products. For the environment, the NFRC rating system helps reduce energy usage, greenhouse gas emissions, and reliance on fossil fuels.

In summary, the National Fenestration Rating Council energy performance rating system is a standardized and objective approach to measuring, comparing, and promoting the energy performance of windows, doors, and skylights. By providing consumers with reliable information about the energy efficiency of building products, the NFRC is empowering them to make informed decisions, lower their energy bills, and reduce their carbon footprint. As energy efficiency becomes increasingly important in the building industry, the NFRC will continue to play a critical role in advancing the energy performance of products and shaping the future of sustainable building design.