Thermal Performance of the Entire Window
ENERGY STAR® & NFRC…TRUST THE EXPERTS
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ENERGY STAR was created by the United States Department of Energy to establish a program for evaluating the thermal performance of windows and their suitability for different geographic regions of the country. Windows must be tested to the National Fenestration Rating Council (NFRC) standards. Windows must be certified by an independent third party as meeting the NFRC test standards and unbiased criteria set by ENERGY STAR.
All Seaway windows with low E glass meet and surpass these criteria and are ENERGY STAR qualified in all 50 states.
Get the latest Flash Player to see this player.VIDEO: “What Do the Numbers Mean?” with Zach McCartney, Engineering Manager
1. U FACTOR: THERMAL INSULATION
The U Factor indicates how easily heat will flow through the window, whereas R Factor indicates the opposite: how well the window will resist heat flow. The lower the U Factor, the better a window insulates.
2. SOLAR HEAT GAIN COEFFICIENT
Solar Heat Gain Coefficient (SHGC) is the amount of solar radiation admitted through a window. The lower a window’s SHGC, the less solar heat is transmitted into the house and the easier it is to keep your house cool in the summer. On the other hand, in northern climates a higher SHGC can provide beneficial passive solar heating in the winter. Seaway offers a variety of high performance glass coating packages with varying SHGC ratings to suit your needs, based on your climate.
3. VISIBLE TRANSMITTANCE
Seaway’s spectrally selective glass coating packages have been designed to enhance a window’s thermal performance by blocking ultraviolet and infrared light, and in turn, block some visible light as well. Clear glass itself blocks about 20% of visible light.
4. AIR INFILTRATION
The amount of air that can pass through the seals of a window’s operating sashes, measured by a fraction of cubic feet per minute per square foot of window at 25 mph winds.