Your Source for Green Heating, Cooling, & Plumbing on Martha's Vineyard

Contact Us

Contact Us


Nelson Mechanical Design (NMD) has a new phone system! After dialing 508 696 3120, please use the following extensions:

Bookkeeping:  please press 2 to reach Clara Matherly for all bookkeeping and financial statements.   Her email is

Human Resources and Marketing:  please reach out to Sarah Henry at

Service Manager:  please press 1 to reach Marlon Dwyer for all service scheduling and invoicing.  His email is

Mini-Splits:  please press 4 to reach Nick Lucas for all mini-split projects at NMD.   His email is

HVAC and Plumbing: please press 3 to reach Dave Sprague for all Plumbing and HVAC projects. His email is

Geothermal – Radiant – Rescue Team: please reach out to Brian Nelson at


Mailing Address:

Nelson Mechanical Design, Inc.,

455 State Road, PMB #264,

Vineyard Haven, MA 02568

By Fax: 508-687-9565


Physical Address:

441 State Road

Vineyard Haven, MA 02568

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Thank you for your inquiry!

We appreciate your interest in our services and installations! We look forward to working with you towards meeting your HVAC and plumbing needs. Our goal is to respond quickly to your query – we try to respond via phone or email the same day for service queries and within a few days for new construction projects.

If you are inquiring about service, you will most likely hear back from Marlon Dwyer, our service manager
(  phone extension 1):

If you are inquiring about the installation of a new HVAC or plumbing system, you will most likely hear back from Dave Sprague, the head of our new construction department.  (  phone extension 3):

If you are inquiring about the installation of a mini-split heat pump, you will hear back from Nick Lucas, head of our mini-split department.   ( phone extension 4)