ENERGY STAR is a joint program of the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices. Results are already adding up. Americans, with the help of the ENERGY STAR program, saved enough energy in 2007 alone to avoid greenhouse gas emissions equivalent to those from 27 million cars - all while saving $16 billion on their utility bills.

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Energy efficient choices can save families about a third on their energy bill and similar savings on greenhouse gas emissions, without sacrificing features, style, or comfort. ENERGY STAR helps you make the energy efficient choice.

When looking for new household products, look for the ENERGY STAR seal. They meet strict energy efficiency guidelines set by the EPA and US Department of Energy. When looking to make larger improvements to your home, the EPA offers tools and resources to help you plan and undertake projects to reduce your energy bills and improve the comfort of your home. Since the energy efficient performance of windows, doors, and skylights varies by climate, product recommendations are given four U.S. climate zones. For comparisons among ENERGY STARĀ® products and selecting the best product available read Buying Energy Efficient Windows or go to


The Department of Energy (DOE) issued its revised 2010 criteria for the Energy Star windows, doors, and skylights program. The full report is available, please follow the link.





Among the most notable changes made in the final document are changes concerned the window criteria for the Northern zone. DOE tightened the U-factor criteria to the 0.30 level. To maximize the number of products qualifying in the zone, DOE chose not to set an SHGC maximum. DOE determined it was worthwhile to recognize the benefits of higher solar gain in some applications.

In the Southern zone SHGC is allowed up to 0.27. DOE officials note that stakeholders had expressed concern that the very low SHGC previously proposed would have reduced visible light transmission, and DOE decided it did not want to encourage production of windows providing less visible light.