HERS Rater Near Braintree, MA

The Role of a HERS Rater in Building Performance

The Home Energy Rating System (HERS) is the nationally recognized standard for measuring a home’s energy efficiency. A HERS Rater is a certified professional trained to assess, test, and score residential buildings using this system.

During construction, a HERS Rater inspects the insulation, ductwork, air sealing, windows, and mechanical systems to evaluate how efficiently the home uses and retains energy. The lower the HERS Index Score, the more efficient the home. For example, a home with a score of 50 uses 50% less energy than a standard reference home built to 2006 energy code standards.

Massachusetts requires HERS ratings for most new residential projects to demonstrate compliance with state and local codes. Our experts help you navigate this process efficiently—providing both the technical expertise and the documentation you need to stay compliant.

Comprehensive Energy Testing and Verification Process

At Home Energy Efficiency Consultant, we follow a detailed, data-driven approach for every HERS rating. Our testing process is designed to meet RESNET standards and Massachusetts code requirements.

1. Plan Review and Energy Modeling

Our process begins with a review of your building plans and specifications. Using advanced energy modeling software, we create a digital representation of your home’s structure and mechanical systems. This allows us to simulate its expected performance, identify areas where efficiency can be improved, and predict the projected HERS Index Score before construction even begins.

We’ll provide recommendations on insulation values, HVAC design, window performance, and air sealing strategies to help optimize your results from the start.

2. On-Site Pre-Drywall Inspection

Before walls are closed, our raters perform a pre-drywall inspection to verify that insulation and air barriers are installed correctly. This step ensures your project stays on track for code compliance and avoids expensive rework later. We check for insulation gaps, compression, and proper installation techniques that align with RESNET Grade I standards.

3. Blower Door and Duct Leakage Testing

Air leakage is one of the most significant factors affecting home efficiency and comfort. Using a blower door test, we measure how airtight your home is by quantifying how much air escapes under controlled pressure conditions.

We also conduct duct leakage testing to assess the efficiency of your HVAC distribution system. These tests determine if energy is being wasted through leaks in the ducts or building envelope. Results from these measurements directly influence the final HERS Index Score and are mandatory for code compliance in Massachusetts.

4. Final Inspection and HERS Index Calculation

Once the home is complete, we perform a final inspection to verify compliance with the approved design and collect all necessary performance data. This includes confirming insulation, ventilation systems, and mechanical performance.

Using all the gathered data, we calculate your final HERS Index Rating and issue an official certificate that can be submitted to local code officials, lenders, or energy efficiency programs.