Marc, today's charrette was terrific. Thank you for your truly generous collaboration. You've caused me to turn a mental corner. Until recently, I thought that to do really intelligent buildings, we'd need the right clients, the right engineers, and a premium budget. Thanks to you, I now believe that to do intelligent buildings all we need is INTELLIGENCE!—and the guts to ask the simple questions until we get the answers, and the courage of our convictions to persuade others...

We can do this and it will change things. You've empowered us. Thanks. –Ellen

We can help you

  • Create a green building or community that is healthy, comfortable, resource efficient, durable, adaptable, and well-loved by the people that inhabit it
  • Build a project vision shared by all the participants, structured with clear goals and metrics
  • Maximize the value you will receive for the resources you invest
  • Educate a diverse community about green design and its compelling benefits
  • Select a collaborative project team capable of achieving your goals and objectives, and create an integrated systems design process that utilizes everyone's collective wisdom
  • Build an enduring relationship with a nationally recognized green design expert with over 30 years of experience helping people and organizations like yours realize their green ideals and aspirations
  • Have fun along the way!

ABX 2013 presentation


The next Zero Net Energy Homes online course starts in February!

Zero Net Energy Homes Online Course

We achieved zero net energy at our home. Please look at my new blog!

Thriving on Low Carbon

NESEA recognizes Marc with the 2012 Professional Leadership Award at Building Energy 2012

This award recognizes exceptional quality of work, integrity, and generosity in sharing knowledge. It's wonderful to be acknowledged by one's tribe!

New report on 8 houses designed to be zero net energy possible, and detailed information on the first year's monitoring. See Eliakim's Way Zero Net Energy report on the Resources page.

Marc's presentations from Building Energy 2011 added on the resources page.

Plainfield School Prototype Classroom DER approach is now extended to the entire 1989 wing of the school. The wing used about 1 kWh/sf the first year of operation for heating and cooling!

Two Energysmiths' projects, the Holderness NH house and the Livermore DER, are among the first to be meet the Thousand Home Challenge!

See presentations Marc made at Building Energy 2010 and Affordable Comfort 2010 on Zero Energy Homes, the Plainfield, NH School Prototype Classroom DER, and Balancing Investment between Envelope, Mechanicals, and Renewables under the Resources link

Five New Client Case Studies Added!

NESEA awards Distinguished Service Award to Marc at Building Energy 2009.

Deep Energy Retrofits - superinsulating an existing building. Energysmiths has several DERs in progress, maybe we can help you, too!

Marc was a founding board member of the Passivehouse Institute of the US, is a Certified Passive House Consultant, and is helping clients analyze their projects in the PHPP software. See to learn more about the most energy-efficient homes in the world.

Holderness, NH house Deep Energy Retrofit achieves net zero energy in its first year of operation!

We offer the following workshops:

Introduction to Passive House

Nuts and Bolts of Superinsulated Homes

Towards Zero Energy Homes

Deep Energy Retrofits

Mechanical Systems for Architects and Builders

Contact us for more information about holding a workshop.

Marc was the keynote speaker at NESEA's Building Energy Conference March 10-12, 2009 in Boston, MA.

See his presentation here: BE2009 keynote

Marc was the keynote speaker at the Affordable Comfort conference in Pittsburgh April 7-11, 2008.

See his presentation here: ACI Keynote

Garthwaite Center at Cambridge School of Weston selected for 2008 AIA's Earth Day Top Ten! This is Energysmiths' third project to be so recognized.


We have worked with Vermont Law School, Stonyfield Farm, Dartmouth College, Yale School of Forestry and Environmental Studies, Cobb Hill Cohousing, MIT, Society for the Protection of NH Forests, William McDonough & Partners, Wampanoag Tribe of Gay Head (Aquinnah), Harvard University, Woods Hole Research Center, College of the Atlantic, Appalachian Mountain Club, Cambridge School of Weston, among many others, as well as hundreds of architects, builders, and residential clients. See our Client List and What Our Clients Are Saying.


Our projects have been received numerous awards and have been recognized nationally by the American Institute of Architects (AIA), American Society of Heating, Refrigeration, and Air-Conditioning Engineers (ASHRAE), Energy and Environmental Building Association (EEBA), and Northeast Sustainable Energy Association (NESEA). See our Awards.

Our collaboration with the Society for the Protection of NH Forests on the French Wing resulted in the first LEEDTM building in New England, at the Gold certification level.