The National Fenestration Rating Council (NFRC) is a non-profit trade organization that certifies windows and doors using standardized criteria. All reputable window and door manufacturers submit their products for testing. Ask to see the NFRC label for any product you’re considering before you sign a contract. For more information, visit nfrc.org.
Here are a few things to look for:
U-Value: The U-value (or factor) indicates how much heat flows through the window. A lower number means the window will insulate better.
Solar Heat Gain Coefficient: A measure of the amount of solar heat absorbed through a window, which is especially important during the summer months.
EnergyStar: A program of the Environmental Protection Agency to help consumers make well-informed purchase decisions on energy-efficient products.
DP Rating: Design Pressure (DP) ratings indicate how well the product can withstand structural load, water pressure, and air infiltration (wind). A higher value indicates a more durable product.
All CVP Windows & Doors windows and doors meet or exceed EnergyStar standards and are certified by the American Architectural Manufacturer’s Association (AAMA) and the National Fenestration Ratings Council (NFRC).
Our windows also carry a DP rating of 50, which means they’ve been tested to withstand hurricane-force winds up to 173 mph.