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A home energy rating is a standard way to measure the energy efficiency of residential buildings. An energy rating examines characteristics such as air and duct leakage, insulation levels, window efficiency, wall-to-window ratios, the heating and cooling system efficiency, the solar orientation of the home, major appliances, and lighting. These factors determine the score ("HERS Index") each house receives on a standardized scale that is based on the International Energy Code. This score determines whether a house is an ENERGY STAR Home.

Energy ratings benefit home buyers by providing a comparison between the energy costs of new homes. A rating can benefit an existing homeowner by providing an outline of cost-effective energy improvements. Builders can benefit from energy ratings by analyzing what materials and building techniques improve the energy efficiency of a newly constructed home. Builders can also apply for a tax credit on every house they build that meets certain energy criteria.

To learn more about energy ratings and the standards that govern them, you can visit the Residential Energy Network (RESNET) web site or the ENERGY STAR Homes Program web site.