HERS Rating vs. Energy Audit in Massachusetts: What’s the Difference?
Published by HERS Rating Company
If you’ve been researching energy efficiency in Massachusetts, you’ve probably encountered both “HERS Rating” and “energy audit.” They’re not the same thing. Understanding the difference could save you time, money, and hassle.
What Is a HERS Rating?
A HERS Rating (Home Energy Rating System) is a standardized index by RESNET that measures home energy efficiency on a scale from 0 to 150. Lower is better. A score of 100 represents a typical 2006 code home. HERS Ratings are required for MA Stretch Code compliance, Mass Save new construction rebates, and ENERGY STAR certification.
What Is an Energy Audit?
An energy audit is an assessment of an existing home’s energy use — identifying opportunities to reduce utility bills through insulation, air sealing, HVAC upgrades, and more. Massachusetts offers free Mass Save home energy assessments for existing homes.
Key Differences
| Feature | HERS Rating | Energy Audit |
|---|---|---|
| Primary Use | New construction code compliance | Existing home improvements |
| Who Performs It | RESNET-certified HERS Rater | BPI/ASHRAE certified auditor |
| Required For | MA Stretch Code, Mass Save new construction | Mass Save rebates on existing homes |
Need a HERS Rating in Massachusetts?
RESNET-certified, 24-hour reports, all 351 MA cities. Call 617-584-1809.
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HERS Rating Company is a RESNET-certified, Mass Save-approved HERS Rater serving all 351 Massachusetts cities and towns.
Serving Boston, Worcester, Springfield, Cambridge, Newton, Brookline, and all 351 MA cities. Get a free quote →
HERS Rating vs Energy Audit: What’s the Difference in Massachusetts?
A HERS Rating is performed on new construction to verify energy code compliance — it’s a predictive energy model combined with physical testing (blower door and duct tests). An energy audit is performed on existing homes to identify energy-saving opportunities. For new construction in Massachusetts, you need a HERS Rating. HERS Rating Company provides RESNET-certified HERS Ratings for all new construction projects across Massachusetts.
Do I Need a HERS Rating or an Energy Audit?
If you’re building new: you need a HERS Rating. If you own an existing home and want to reduce energy bills: you need an energy audit. HERS Rating Company specializes exclusively in new construction HERS Ratings. Call 617-584-1809 for a free new construction consultation in any of the 351 Massachusetts cities we serve.