Getting the sun’s benefits without also accepting its drawbacks is possible thanks to reflective coatings on the glass surface.
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BUYERS TIP: Windows with a high rating may reduce your dependence on artificial lighting and lower monthly utility billsĮfficient windows can allow natural light into a home while also keeping out unwanted heat.A higher number means more natural light.The rating can be found on the middle or bottom row of an NFRC label, on the left side. VISIBLE TRANSMITTANCE: This mandatory rating measures the amount of solar light that can enter a home through a window. NFRC’s ratings system also includes two optional ratings that measure efficiency in areas other than energy use.Ĭlick here to learn more about ENERGY STAR and its Most Efficient Program, which recognizes products that use cutting-edge technologies to deliver the most outstanding efficiency. You can view window ratings by brand using the tool and continue reading this page for window ratings explained. The tool considers each of these three factors, as well as your location and the direction your windows face. The Efficient Windows Collaborative’s Window Selection Tool searches replacement window ratings to find the best options for your home. Lower or higher ratings for each of these areas aren’t always better or worse for your home - that depends on where you live and how much sunlight hits your windows. There are three mandatory window efficiency ratings NFRC evaluates for all windows, including terms you may have heard, such as u-factor ratings and solar heat gain coefficient.
When used to replace old windows, ENERGY STAR-certified products lower a home’s utility bills by an average of 12%.
Environmental Protection Agency’s ENERGY STAR® program to evaluate windows. NFRC window ratings are the best available, as they are used by the U.S. The ratings help consumers compare products and make informed purchases, and every NFRC-rated window has a label affixed to it displaying its ratings. The National Fenestration Rating Council is an independent non-profit organization that establishes objective energy-performance ratings.
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