The Glassroom

Residential: How to Select the Correct Low-E Coating

Low-E coatings are an important consideration when it comes to selecting the right kind of glass for your home. They determine most of a window’s performance characteristics, which are measured primarily through U-Factors and Solar Heat Gain Coefficients (SHGC). Depending on the coatings selected, and the part of the country in which the residence is situated, they are instrumental in keeping heating or cooling costs down.

Low-E coatings are designed to reduce energy. In northern climates, there are more heating degree days than cooling degree days. Therefore, selecting a product that will transmit more free energy from the sun will be beneficial to reducing the energy used for heating. In southern climates, there are more cooling degree days than heating degree days, so selecting a product that will block the energy from the sun will be beneficial in reducing the energy used for cooling.

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