Geothermal.contractors

Nelson Mechanical Design, Inc. has operated on Martha's Vineyard since 2004, providing geothermal, plumbing, and HVAC design and installation for residential and commercial properties across the island from its base at 441 State Road in Vineyard Haven. The firm designs and installs geothermal ground-source heat pump systems alongside ductless mini-splits, radiant heating, solar hot water, well-water service, and water treatment, and roughly sixty percent of its work involves sustainable green systems. Nelson Mechanical designed and installed the geothermal heat exchanger at the Mansion House hotel in Vineyard Haven, and its projects have earned national green-design awards. The company emphasizes sizing and configuration for the island's coastal climate and offers around-the-clock emergency plumbing and HVAC service, handling new installations, repairs, and maintenance across every system type it supports. Verified active operator per https://www.nmdgreen.com/ + https://www.mvtimes.com/2015/07/15/nelson-mechanical-design/ (Bundle 4 audit 2026-05-28)