Want to know how a house works? Learn the basics of building science to help you understand the world of building science, home energy efficiency, green jobs, and more.

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A home energy rating (often called a HERS rating) is an official analysis of a home's energy performance that includes the following:

If you're here to learn about how to close up, seal, or encapsulate your crawl space, you're in the right place. The links below take you to our pages on the various aspects of this topic, so start clicking.

A complete and accurate analysis of home performance should include diagnostic and performance testing. Performance testing gives you a number that you can use to see how one house compares to others or to some program criterion. For example, a performance test indicates that the duct

From 2001 to 2003, I put in countless hours designing and building a green home in Carrollton, Georgia. It's a beautiful house and one of the best high performance homes in the Southeast. It's got very little infiltration (1.7 ACH50) and no duct leakage.

Coming across unfamiliar acronyms and initials in building science, green building, and home performance can make understanding difficult.

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