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About Us

Founded in 2009, A9 Green has worked diligently to create more comfortable, energy efficient, and sustainable homes throughout Massachusetts and the Greater Boston Area. As certified RESNET and ENERGY STAR consultants and HERS raters with over a decade of experience, we have become a leader in the industry of building and architectural sciences, energy consulting, and HERS Rating.


We work with a range of individuals from all backgrounds to effectively meet the challenges of Massachusetts’ stringent energy codes for single/multi-family, LowRise, HighRise, and commercial projects.


The team at A9 Green brings a variety of skills and expertise to create a comprehensive approach throughout the entirety of the building process, taking the time to formulate a successful path for design and implementation of each project to achieve the best results. We aim to help builders, architects, developers, realtors, and homeowners not only build better homes, but also:


  • Reduce their construction costs

  • Assure their projects comply with energy codes

  • Take advantage of the latest in technology, building science, and utility-sponsored incentive programs

  • Lower the costs of future utility bills

  • Help our environment


Our business stands by our mission of creating buildings that are safe, comfortable, sustainable, and efficient through the use of cost-effective solutions. Our hundreds of clients and 1,000+ projects are proof that our commitment to customer service, creating superior performing buildings, and our planet is paramount.


Check out our 50+  “Nothing but 5 Stars!”  Google Review Online!

5 star review icon

"They were extremely prompt in getting back to me regarding the initial rating. During the course of remained in contact with me and guided me through of insulation and HVAC specifications. They were also prompt and extremely thorough during the final HERS rating blower door test. As the general contractor and builder for this project, I was pleased with Total Green Energy services and pricing relative to other contractors used and would recommend them to anyone in need of rating or other energy solutions."

Norfolk Kitchen and Bath, Boston, MA

"As a builder and developer, it is critical for us to have qualified and timely consultation and advice to share with our clients. Equally important is the ability to handle testing professionally. With Total Green Energy as our consultant, we were able to achieve results that were even higher than our planned design. Our client ultimately gained thousands in cash rebates."

Mike Bernier, Principal at MKB Partners LLC. Newton, MA

 "I was happy to learn that Total Green Energy Solution was both knowledgeable and helpful in offering ideas and suggestions toward improving my methods and simultaneously satisfying the "Stretch Code" requirement. I plan on using Bijan again as he directed me towards an optimal approach to maximizing efficiency vs cost containment. This culminated in a "Win/Win" situation for my end users and my Companies! ." 

Ralph E. D'Amico Development, Watertown, MA

" I have worked with many HERS raters and have found Bijan to be the most helpful in the way he responds to phone calls and emails and in conveying information about installation procedures.  He was in inspecting the insulation and duct work at the rough inspection and the blower door and duct testing at the final inspection.  Most importantly, he was easy to schedule time with and worked within my project schedule so as to not delay the progress of the project."

D. Cohen. Owner of Hampden Design & Construction, Newton, MA

Our Team

Meet The Team

Bijan KHosraviani, Ph.D.


Picture of Bijan KHostraviani - Principal of A9 Green

Bijan has been in the energy consulting industry since 2006. His main areas of interest are energy efficiency, conservation, and renewable energy. He has an extensive background in building science and has worked both on existing homes as well as new construction. He understands and believes that energy efficiency is one of the least expensive and most effective ways to help our environment.

Bijan is a PHIUS+ (Passive House) Rater and Verifier, RESENT Certified HERS Rater, BPI Building Analyst, ICC Residential Energy Inspector/Plans Examiner, and holds a Ph.D. degree in Civil and Environmental Engineering from Stanford University.

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