When you’re buying your new windows, you may have heard your contractor tell you that their windows are ENERGY STAR®-certified or that they comply with NFRC standards. Window replacement is already complicated as is, and hearing these terms may complicate it even further.
In today’s post, Renewal by Andersen® of Cape Cod hopes to clarify these terms by differentiating what these terms mean in the context of each other.
ENERGY STAR or NFRC?
Which is better? The answer is both are important, although the NFRC—which stands for the National Fenestration Rating Council—ratings can tell you a bit more.
In essence, an ENERGY STAR seal means the product is approved for energy efficiency by relevant government agencies, like the Department of Energy (and the NFRC for fenestration products, like replacement windows). This seal can be affixed on any product, from consumer electronics to home components like windows.
A product with an ENERGY STAR seal means it has passed tests regarding environmental friendliness, but other than meeting the minimum requirements for that type of product, it doesn’t tell you much. You have to consult literature for the specific type of product on the standards for its energy efficiency, though.
By contrast, NFRC ratings describe the performance of a fenestration product (windows, doors, and skylights) in real-world tests. Such ratings—U-factor, solar heat gain coefficient (SHGC), air leakage, visible transmittance, and condensation resistance—measure insulation, heat transfer, lighting, and condensation. These figures are often shown right on the product itself, and most window companies will boast of impressive NFRC ratings.
These ratings are measured on a relative scale. For example, U-factor, SHGC, and air leakage should be as low as possible, while visible transmittance and condensation resistance should be as high it can be.
Renewal by Andersen of Cape Cod is the trusted manufacturer, supplier, and installer of top-quality replacement windows in the area. Call us today at (508) 936-1171 or fill out our contact form for your free windows inspection and diagnosis. We serve Cape Cod, MA and nearby areas.