Posted on September 2, 2016 by Martin Holladay, GBA Advisor
After working for years as a carpenter, Bart Laemmel, a resident of Crested Butte, Colorado, decided to upgrade his skills. “I have a thirst for knowledge,” he said. Speaking at a presentation at the recent Westford Symposium on Building Science, Laemmel deployed his self-deprecating humor. “I am a HERSIndex or scoring system for energy efficiency established by the Residential Energy Services Network (RESNET) that compares a given home to a Home Energy Rating System (HERS) Reference Home based on the 2006 International Energy Conservation Code. A home matching the reference home has a HERS Index of 100. The lower a home’s HERS Index, the more energy efficient it is. A typical existing home has a HERS Index of 130; a net zero energy home has a HERS Index of 0. Older versions of the HERS index were based on a scale that was largely just the opposite in structure--a HERS rating of 100 represented a net zero energy home, while the reference home had a score of 80. There are issues that complicate converting old to new or new to old scores, but the basic formula is: New HERS index = (100 - Old HERS score) * 5. rater,” he said. “It was an intense training — seven days straight. I figured I knew everything. And I am a LEEDLeadership in Energy and Environmental Design. LEED for Homes is the residential green building program from the United States Green Building Council (USGBC). While this program is primarily designed for and applicable to new home projects, major gut rehabs can qualify.
professional. I know how to check stuff off.”