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Products

Our role is to install and service the most reliable and modern heating, cooling, ventilation, air quality, plumbing, and water treatment equipment available.  We serve as an essential filter for our customers – determining what innovations are worth pursuing and what new products we can stand behind.  This requires a constant commitment to training the NMD team so that we know how to service what we install.

Our goal is to be Martha’s Vineyard’s premier plumbing and HVAC shop – we appreciate the opportunity to service, install, and rescue your system!

Air Conditioning

We have spent a lot of effort to find the best air conditioning systems for the Vineyard market – units that combine efficiency with robust design and ease of service.  All air conditioning systems available on the market today use some sort of computerized control to meet current federal efficiency standards.  Unfortunately, the Vineyard electrical grid is overloaded which results in seasonal…

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Boilers & Hydro Air

We started out over ten years ago installing a lot of boilers and “hydro air” heating systems.   “Hydro air” refers to a heating system with ductwork and a fan coil (an air handler with a blower) with a hot water coil connected to a boiler.  The boiler provides hot water which heats up the hot water coil, in turn heating the…

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Domestic Hot Water

Domestic Hot Water (DHW) is potable water that is heated above 110 F (as opposed to pool heating or space heating) and is suitable for bathing, drinking, and washing clothes and dishes. Massachusetts State Plumbing code specifies that “the maximum temperature of the domestic hot water in residential buildings shall not exceed 130 F” and that showers have a temperature control mixing valve…

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Furnaces

We currently offer Carrier furnaces to go with our Carrier Greenspeed Infinity air source heat pumps as our top of the line.  They are modulating propane furnaces that can connect to the wifi Carrier Infinity thermostat with remote access.  Their fully modulating blower works seamlessly with the Carrier Greenspeed heat pump – the heat pump provides heat for the first stage and…

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Heat Pumps (Air to Water)

We have installed several Daikin Altherma heat pumps but it appears that they are no longer available from Daikin.  We are investigating several other heat pumps including those made by Spacepak and Electro Industries: Spacepak http://spacepak.com/hydronics/pdf/SpacePakHydronics.pdf Electro Industries http://www.electromn.com/pdf/NL202.pdf There is a very informative article on the Green Building Advisor website about the state of the air to water heat pump market…

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Heat Pumps (Ducted)

We currently offer Carrier heat pumps for ducted systems, Daikin mini-splits for single room flexibility, and Mitsubishi combination systems (mini-split wall units and small ducted units) for multiple zones.   In our experience, these brands are the most robust in terms of dealing with Vineyard voltage issues while providing flexibility and efficiency in heating and cooling your home.  It is important to…

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Heat Pumps (Geothermal)

We currently offer ClimateMaster geothermal heat pumps for ducted systems that provide heating and cooling in conjunction with a geothermal field.   In our experience, the ClimateMaster brand is robust in terms of dealing with Vineyard voltage issues while providing flexibility and efficiency in heating and cooling your home.  It is important to determine what your summer and winter comfort goals are…

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Heat Pumps (Mini-Split)

Mini-splits Heat Pumps are air source heat pumps that have revolutionized heating and air conditioning around the globe – they are the fastest growing and largest part of the global HVAC market.    They can heat a room or a whole house at half the operating cost of propane heating and provide cooling and dehumidification (“dry mode”) too. We currently offer Daikin and Mitsubishi…

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Humidification

Humidification is important in the winter months to maintain a healthy indoor air climate.  Relative humidity levels below 40% will lead to sinus irritation and increased respiratory infections.  Conversely, humidity levels above 60% can lead to mold and mildew growth.  Therefore, humidification needs to be well controlled to make sure it is in the proper range and in sufficient quantity. Humidity can…

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Indoor Air Quality

Ventilation, Spray Foam, Tight Houses: RESIDENTIAL SYSTEMS: The construction of the residential envelope is getting tighter and tighter. Products such as icynene, high density spray foam, and cellulose insulation are creating little or no infiltration into the building. This is great way to reduce the heat loss/gain of a building.  However, fireplaces, gas appliances, and boilers and water heaters require fresh air…

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Plumbing

Nelson Mechanical Design is fully licensed to perform plumbing in Massachusetts: Brian Nelson, Dave Sprague, and Paul Vertifuelle are all licensed Master Plumbers. This means that we have the training, experience, and up-to-date knowledge necessary to install plumbing in both commercial and residential structures. We offer design, installation, and service of all types of plumbing and can review the merits of different…

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Radiant Heating

Radiant floor heating is one of the most comfortable ways to heat a residence on the market.  When installed properly, it can also be very efficient.   Radiant heat depends on a large surface area – such as a floor, ceiling, or wall, that is heated This is due to the relatively low temperature at which radiant floor systems operate. Most conventional…

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Solar Hot Water

The Sun provides the Earth with an astounding level of free energy every day.  The Sun will also never send you a bill! What is Solar Hot Water? Instead of using the sunshine indirectly (either through the Earth for geothermal or the air for air source heat pumps), a solar hot water system collects this energy directly from the Sun.  Because the…

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Thermostats (Conventional)

Honeywell TH6110D1021U  (6000 series)  Programmable Digital Thermostat https://customer.honeywell.com/en-US/Pages/Product.aspx?cat=HonECC+Catalog&pid=TH6110D1021/U# “Honeywell’s FocusPRO® 6000 offers the perfect blend of features, performance. energy savings and value. With an easy-to-read digital display, FocusPRO 6000 prominently displays both room and set temperature.”  (from the Honeywell website) Selectable to 5-1-1 (Weekdays, Saturday, Sunday) or 5-2 (Weekdays, Weekend) programmable thermostat. Large, clear, backlit display – easy to read in various…

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Thermostats (Internet and Wi-fi)

Carrier Infinity Remote Access Touch Control (Wi-fi Touch Screen): http://www.carrier.com/residential/en/us/products/thermostats/systxccitc01-a/ “The Infinity Touch control is the key to unlocking your comfort potential. It’s also the brains behind a Greenspeed™ intelligence system. As part of a complete Infinity, communicating system, this one control can manage temperatures, humidity, ventilation, airflow, indoor air quality and up to eight zones. If your system includes a heat…

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Water Treatment

What is Water Treatment? Living on Martha’s Vineyard comes with many wonders and struggles.  Water quality can be one of those struggles.  The water on the Vineyard varies tremendously based on the different layers left by the receding ice sheet 10,000 years ago.  So levels of iron, manganese, and other minerals as well as acidic or basic water can vary dramatically from property…

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