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Passive House

Efficient Building


Green Building Rating

An Energy Efficiency Consulting and Improvement Company

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With A9 Green

A9 Green has been conducting Energy Consulting and Home Energy Ratings (HERS Rating) in over 95 cities and towns in Massachusetts since 2009. We work with developers, architects, builders, and homeowners in the Greater Boston and Eastern Massachusetts areas. With expertise in digital 3D and energy modeling, Massachusetts code compliance, and architecture and building science, we provide a variety of services to ensure new homes meet and exceed energy efficiency standards.


community of houses
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Our Mission

To help the environment by helping you build a better, more comfortable, more sustainable, healthier place to live.

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Our Vision

By applying the latest knowledge and technologies in building science, we aim to improve the energy efficiency of buildings, while making them more sustainable for our future generations.

House Frames
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Our Commitment

To provide the best customer and employee satisfaction while delivering successful services which positively impact our planet.

Apartment building using A9 Green energy consulting and HERS rating.
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Why A9 Green?

With 10 years of experience and over 1,000 projects, we have built our reputation on hard work, integrity, and great service. Our expertise and capabilities enable us to be an effective contributor to your project team. 

Our mission is to help create buildings that are:

Shield icon to symbolize safer homes with A9 Green, Aero Barrier, and HERS rating


Healthier homes with A9 Green icon - heart symbol


Heating symbol - represents more comfortable homes with HERS rating and energy consulting


Recycle symbol/green energy icon to show A9 Green's commitment to sustainability.
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Environmentally Friendly

Money/coin symbol to symbolize higher resale and rental value of HERS rated homes.
Energy efficient home symbol to represent more efficient buildings with HERS rating and Aero Barrier

Higher Resale and Rental Value


Energy Efficient

Aero Barrier Seal set up in construction site (rough-in stage) to seal envelope.
Apartment complex with HERS rating and energy efficient construction.

How can A9 Green help you?

A9 Green administers a wide variety of services for builders, architects, and homeowners to help create the most energy efficient projects in Massachusetts. Our work ranges from single and multi-family homes to HighRise, LowRise, and commercial spaces. Whether the project is new construction, renovation, or addition, we will work with you to pass all code requirements and get you up to thousands of dollars in rebates if qualified.

Send us an email with your interests, and we will get back to you on how to begin your energy saving process. 

Or give us a call at:

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Mass save partner logo
U.S. Green Building Council Member
Certificate of Recognition from ENERGY S
Residential Energy Services Network (RESNET) Rater Member logo
International Code Council (ICC) member logo
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