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The Stretch Code (Massachusetts Stretch Energy Code – 780 CMR Appendix 120AA) mandates that homes achieve a Home Energy Rating System (HERS) rating of 55 or less. HERS is designed so that houses built to the standard building code achieve a rating of about 100 (the base code in Massachusetts yields a bit below 100), so a 55 means that the home is about 35% more efficient than a similarly sized home built to base code levels.
All HERS Buildings in the State of Massachusetts have a minimal score requirement of 55 per IECC 2018.
Prescriptive Ratings are also available utilizing RESCheck software to help remodeling projects meet the code requirements.
The HERS Index is a scoring system established by the Residential Energy Services Network (RESNET) in which a home built to the specifications of the HERS Reference Home (based on the 2018 International Energy Conservation Code) scores a HERS Index of 100, while a net zero energy home scores a HERS Index of 0. The lower a home's score the more energy efficient it is in comparison to the HERS Reference Home.
Each 1-point decrease in the HERS Index corresponds to a 1% reduction in energy consumption compared to the HERS Reference Home. Thus a home with a HERS Index of 85 is 15% more energy efficient than the HERS Reference Home and a home with a HERS Index of 80 is 20% more energy efficient.
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