Blower Door Testing

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What is an energy audit or HERS Rating

A Home Energy Rating, performed by a Certified HERS Rater, consists of a full visual analysis of components and aspects of the home, along with energy performance testing of air infiltration with a tool called a blower door.  Evaluation of home energy bills can also be included. 

A blower door slightly de-pressurizes the home and determines the amount of air leakage present.  The home is compared to a hypothetical reference home which is based on the IECC 2004, and the home is then provided with a rating.  The rating can be a numerical HERS rating or a ‘star’ rating based upon ENERGY STAR® requirements. 

RESNET; Establishes rules for the energy rating industry

In 1995 RESNET was founded to develop a national market for home energy ratings and energy efficient mortgages.  One main goal of RESNET was the development of standards for quality of rating services.  The standards set the national procedures for home energy ratings, and include testing and accreditation for raters and providers, development of verification processes for homes meeting ENERGY STAR® and energy efficient building standards, as well as meeting local Energy Code compliance.

A certified HERS Rater follows a prescribed standard for how a home is measured, verified and rated, and must comply with national standards to continue to perform certified ratings.

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