Independently Tested to Prove Superior Energy Performance!

The Sunrise Windows installed by Twin Cities Siding Professionals are ENERGY STAR qualified, and are independently tested by National Fenestration Rating Council (NFRC). The label from the independent NFRC is your way of knowing that the window you are buying has been tested and rated for energy efficiency. The NFRC runs laboratory tests to measure several key factors that affect a window’s performance.


Sunrise Windows have a “U-Factor” that is among the lowest of all windows tested by the National Fenestration Rating Council. That means our windows help keep the warm air in your home all winter. U-factor measures how well a product prevents heat from escaping. The rate of heat loss is indicated in terms of the U-factor (U-value) of a window assembly. U-Factor ratings generally fall between 0.20 and 1.20.  The insulating value is indicated by the R-value which is the inverse of the U-value. The lower the U-value, the greater a window’s resistance to heat flow and the better its insulating value.

Solar Heat Gain Coefficient (SHGC)

Sunrise Windows have a very low solar heat gain coefficient, helping to keep the sunlight out and maintaining your home’s cooler temperatures in the summer. Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight. The SHGC is the fraction of incident solar radiation admitted through a window and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a window’s solar heat gain coefficient, the less solar heat it transmits.

Visible Transmittance (VT)

Sunrise windows have very high VT ratings, meaning the window panes are clear, not cloudy or foggy. Visible Transmittance  (VT) measures how much light comes through a product. The visible transmittance is an optical property that indicates the amount of visible light transmitted. VT is expressed as a number between 0 and 1.  The higher the VT, the more light is transmitted.

ENERGY STAR is a U.S. government program that gives people the power to protect the environment in a cost effective way without sacrificing quality or product features. However ENERGY STAR qualification is based on U-Factor and SHGC ratings only. Many window brands will meet that qualification but that does not make them truly energy efficient. Air infiltration ratings are critical for ultimate window performance and NFRC will only register 0.1 as their lowest number and ENERGY STAR does not use this factor.

AAMA Certified
Sunrise Windows are also certified through the American Architectural Manufacturers Association’s Certification Program. The AAMA’s is the only program in the window and door industry that requires that components used in the finished window and door assembly pass their own set of performance tests. The program also requires the use of AAMA – accredited labs so that tests are performed by qualified, experienced professionals using properly calibrated equipment.

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