The energy performance of all ENERGY STAR qualified windows must be independently tested, certified, and verified according to test procedures established by the National Fenestration Rating Council (NFRC). NFRC is a third-party non-profit organization that sponsors certified rating and labeling to help consumers compare the performance of windows, doors, and skylights. Once rated by this third party, ENERGY STAR helps consumers to find NFRC-certified products with superior energy performance.
NFRC Rates Performance in Five Categories
The NFRC label can be found on all ENERGY STAR certified windows, doors, and skylights and rates performance in five categories: U-Factor, solar heat gain coefficient, air leakage, visible transmittance, and condensation resistance. ENERGY STAR qualification is based on U-factor and SHGC ratings only:
Sometimes also referred to as U-value, U-factor measures the rate of heat transfer and tells you how well the window insulates. U-factor values generally range from 0.20 to 1.20 and are measured in Btu/h. ft² °F. The lower the U-factor, the better the window insulates.
Solar Heat Gain Coefficient (SHGC)
The SHGC is the amount of solar radiation admitted through a window. SHGC is expressed as a number between 0 and 1. The lower the number, the better the window is at blocking unwanted heat from the sun. In warm climates, you’ll want the lowest number you can find; in cold areas, a higher number is better.
Energy Efficient Andersen Window Glass Options
At All-Weather Window, Doors and Siding, we choose to offer Andersen replacement windows to our Kansas City customers. The Andersen window brand has demonstrated integrity and innovation for over 100 years and is the most recognized and most used brand in the window industry. Andersen replacement windows are simply the best replacement windows in Kansas City that we have found.
Andersen offers one of the industry’s widest arrays of glass options, enabling you to find the right choice for your home.
Low-E4® SmartSun™ Glass Offers our best overall thermal performance. It gives you the benefits of Low-E4® glass, plus it helps shield your home from the sun’s heat and filters out 95% of harmful UV rays while letting sunlight shine through.
Low-E4® Glass Offers outstanding thermal performance for climates where both heating and cooling costs are a concern. Up to 56% more energy efficient than ordinary dual-pane glass.
Low-E4® Sun Glass Offers outstanding thermal performance in southern climates where less solar heat gain is desired. It’s tinted for maximum protection from the effects of intense sunlight while providing all the benefits of Low-E4® glass.
Dual Pane Glass Dual-pane glass is available for projects where codes allow its use. See local code official for requirements in your area.
If you’re ready to add Andersen energy efficient windows to your Kansas City home, give All-Weather Window, Doors and Siding a call at (913) 262-4380 and we’ll help you choose the right Andersen windows for your home.