RATINGS
There are two types of ratings. The first is a PROJECTED rating. This type of rating is performed prior to the construction (plan review) of a home or prior to the installation of energy improvements to an existing home.
The second type of rating is a CONFIRMED rating. This type of rating is an on-site inspection using testing equipment to confirm the actual home performance. These types of ratings are performed by a certified home energy rater. Home energy raters are trained and certified by a RESNET accredited home energy rater training provider.
The home energy rater reviews the home to identify its energy characteristics, such as insulation levels, window efficiency, wall-to-window ratios, the heating and cooling system efficiency, the solar orientation of the home, and the water heating system. Performance testing, such as a blower door test for air leakage and duct leakage, is usually part of the rating.
The data gathered by the home energy rater is entered into a RESNET accredited computer program and translated into rating score. The home receives a score between 1 and 100, depending on its relative efficiency. An estimate of the home's energy costs is also provided in the report.
(Source: Residential Energy Services Network, www.natresnet.org)