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

About Us

About Us

Our History

David Sprague and Brian Nelson started Nelson Mechanical Design in 2004 – seeing the need for a “green” mechanical contractor to meet the energy efficiency and home comfort needs of the Vineyard.

Our Mission

We design, install, and service just about anything to do with heating, cooling, domestic hot water, water treatment, geothermal, heat pumps, and radiant.

Our Commitment

NMD is committed to preserving the fabric of the Island – we provide living wages year-round to 25 employees and their families.  We are open throughout the year with after-hours emergency service for our customers.

Net Zero!

We practice what we preach – our office/shop building is net zero thanks to solar PV, cold climate heat pumps, and heat pump water heaters and we export any excess electricity to our employee housing units via net metering.

Our Team

David Sprague
Master Plumber, Master Sheet Metal, Construction Supervisor License, EPA license, expert with Wrightsoft heating / cooling load suite, duct sizing, equipment sizing, expert at HVAC and plumbing design.

David Sprague

Owner

Nick Lucas
Nick Lucas heads our mini-split department. He has extensive factory training in Mitsubishi heat pump design and installation and use of Mitsubishi Diamond System Builder. He has his Construction Supervisors License and is the NMD expert on Mass Save compliant HVAC systems.

Nick Lucas

Head of Mini-Split Department

Matt Rivers
Matt Rivers is an accomplished expert in HVAC installations and commissioning. He has his Sheetmetal Apprentice license, EPA license, and factory training in Bryant and Mitsubishi equipment.

Matt Rivers

HVAC Technician

Geordie Meub
Geordie Meub is assistant Service Manager, assisting Marlon Dwyer, and also working in the field as a Service Tech. He has training in controls and water treatment.

Geordie Meub

Service Technician

Morgan Michalski
Morgan Michalski has received factory training from Mitsubishi and Bryant for heat pumps and Watersoft for water treatment.

Morgan Michalski

Service Technician

Nick Mais
Nick Mais is an accomplished expert in the installation of heat pumps. He has received extensive training from Mitsubishi in installation and commissioning.

Nick Mais

HVAC Technician

Ethan Hadley
Ethan Hadley works closely with Matt Rivers on HVAC installations. He has extensive construction experience. He has received factory training from Mitsubishi and Bryant in HVAC.

Ethan Hadley

HVAC Technician

Brian Nelson
Myles Sprague is our STEM Intern from the Martha's Vineyard Regional High School.

Myles Sprague

S.T.E.M Intern

Brian Nelson
Master Plumber, Master Sheet Metal, Master's Degree in Mechanical Engineering. EPA licensure, member of ASHRAE, RPA, and AEE Regular contributor to major national trade publications

Brian Nelson

Owner

Marlon Dwyer
Marlon Dwyer is head of our Service Department. He is responsible for coordinating the work of four two person service teams that meet the service needs of over 1000 NMD customers. He has a Business Administration degree from University of Arkansas.

Marlon Dwyer

Service Manager

Matt Rivers
Tom Neadow is a Journeyman Plumber licensed in Massachusetts. He is also an expert in HVAC installations in residential and commercial settings. He has his Sheetmetal Apprentice and EPA license.

Tom Neadow

Journeyman Plumber

Cemane Williams
Cemane Williams is one of our lead Service Techs. He has received factory training from Mitsubishi and Bryant for heat pumps and Watersoft for water treatment.

Cemane Williams

Service Technician

Chris Carr
Chris Carr has received factory training from Mitsubishi and Bryant for heat pumps and Watersoft for water treatment.

Chris Carr

Service Technician

Nevar Christie
Nevar Christie has extensive construction and installation experience. He has received factory training from Mitsubishi in heat pump installation.

Nevar Christie

HVAC Technician

Jeremy Colon
Jeremy Colon works closely with Paul Vertifuelle on Plumbing installations. He has his plumbing apprentice license and is currently working towards his Journeyman License. He has extensive construction experience.

Jeremy Colon

Apprentice Plumber

Casey McCarron
Casey McCarron started at NMD as a high school intern; he has worked at NMD throughout his college years (majoring in computer security) providing critical IT support both at the NMD office and in the field. He is an expert in the Mitsubishi cloud software Kumo app and interface. He is also the architect of this amazing website!

Casey McCarron

IT Administrator

Clara Henderson
Clara Henderson is the business manager at NMD - she keeps all of the balls in the air and is critical to our success! She manages all payments and accounts.

Clara Henderson

Business Manager

Nick Rivers
Nick Rivers is our Service Foreman, responsible for setting the standards and procedures in the Service Department. He is also our Water Treatment expert; he has received factory training from Watersoft, Inc., leading source of water treatment equipment.

Nick Rivers

Service Foreman

Matt Rivers
Paul Vertifuelle is a Master Plumber licensed in Massachusetts. He has vast experience in both residential and commercial plumbing and heating systems. He is also an expert at finish plumbing.

Paul Vertifuelle

Master Plumber

Evan Reid
Evan Reid is one of our lead Service Techs. He has received factory training from Mitsubishi and Bryant for heat pumps and Watersoft for water treatment.

Evan Reid

Service Technician

Oneil Nunes
Oneil Nunes has received factory training from Mitsubishi and Bryant for heat pumps and Watersoft for water treatment.

Oneil Nunes

Service Technician

Brian Nelson
Mike Serino has extensive construction and installation experience. He has received factory training from Mitsubishi in heat pump installation.

Mike Serino

HVAC Technician

JR Thomas
JR Thomas works closely with Tom Neadow on HVAC installations. He has extensive construction experience. He has received factory training from Mitsubishi and Bryant in HVAC.

JR Thomas

HVAC Technician

Brian Nelson
Shammai Thompson has extensive construction and installation experience. He has received factory training from Mitsubishi in heat pump installation.

Shammai Thompson

HVAC Technician