REM:Rate 12.5 - A Versatile Energy Application

September/October 2008
A version of this article appears in the September/October 2008 issue of Home Energy Magazine.
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September 07, 2008
Steve Mann is a HERS rater, Green Point rater, LEED AP, remodeler, and long-time software engineer. As many Home Energy readers know, the Residential Energy Services Network (RESNET) is a U.S.-based, national standards-making nonprofit that defines energy efficiency rating systems. Their best-known system is the HERS index, a numerical value ranging from 0 to over 100 that quantifies the energy efficiency of residential structures. A HERS index of 100 represents the energy used by the American Standard Building and an index of 0 indicates a building that uses no net purchased energy. This rating is used in qualifying homes for energy-efficient mortgages (EEMs), energy improvement mortgages (EIMs), DOE Energy Star Homes and Building America programs, U.S. federal government energy efficiency tax credits, International Energy Conservation Code (IECC) compliance, and most recently, LEED for Homes certification. Clearly, this standard is widely used and well regarded. In a typical scenario, a RESNET-certified HERS inspector does an on-site inspection of an existing property, measuring its energy characteristics, such as insulation levels, window efficiency, wall-window ratios, heating and cooling system efficiencies, and the solar orientation of the home. Performance testing, such as a blower door test measuring door and duct leakage, may also be used. ...

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