Energy Excellence in Martha’s Vineyard

Nelson Mechanical Design (NMD) has a long‐standing reputation for being a green contractor, and it goes beyond the steps many HVAC contractors are taking now, well intentioned though they may be. That’s because NMD has been a trailblazer, pushed in part by the progressive customers on Martha’s Vineyard. We already introduced one of them in the article that ran in the May 5 NEWS: The Doug Rothmann home on the Vineyard is a net‐zero energy, LEED for Homes building powered by a wind turbine. The horizontal, 6‐ton, direct‐exchange geothermal system serves radiant space‐ heating loads. A heat pump uses R‐407. It’s only one of several geothermal projects the company has designed and installed. The system’s zoned control adds considerably to its functionality and convenience to the homeowner.

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