How Energy-Efficient Windows Work

As a proud ENERGY STAR partner, Weathershield ensures our products are rated, certified and labeled for U-Value and Solar Heat Gain by the National Fenestration Rating Council (NFRC).

According to the U.S. Department of Energy, a home's windows consume up to 3.8 quadrillion BTUs of energy annually in the form of heating and air conditioning expenses. At a cost of more than $30 billion to homeowners, it pays to compare glazing options when choosing windows for your home.

The estimated savings for a typical home, from replacing double-paned wood windows with Zo-e-shield windows, are significant in all regions of the country and can range from 15% to 30% a year.



The ENERGY STAR label, first introduced by the Environmental Protection Agency in 1992, has grown to identify efficient products in more than 35 categories.

The ENERGY STAR criteria for residential windows and doors are tailored to four Climate Zones. A product's energy efficiency for a given climate is based on its impact on heat gain and loss in cold weather and heat gain in warm weather.

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