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Commercial HVAC Systems & Maintenance


Commercial Heating and Air Conditioning:

It is our goal with each heating and cooling service project we take on to provide you and your staff with a comfortable work environment that promotes clean air and energy savings. Our HVAC preventative maintenance services include: heating and air conditioning, rooftop units, boilers, chillers, air handlers, heat pumps and indoor air quality to commercial and industrial facilities across New Hampshire and Massachusetts including the greater Boston area.

Rooftop Units: 

MSI Mechanical provides a complete line of HVAC equipment including gas fired and electric cooling rooftop units, electric cooling rooftop units with optional electric heat, heat pump rooftop units and water source heat pump rooftop units to meet your most demanding HVAC requirements.



For over 40 years, MSI Mechanical has been the leading provider of commercial and industrial service and installation to a wide variety of customers. If you experience a problem, our emergency commercial chiller repair service department is available 24 hours per day 7 days a week.


Split Systems:

No matter the season or temperature, you can depend on dual fuel heating and cooling systems or air handlers to provide the ideal combination of efficiency and comfort.


Preventative Maintenance:

It is aimed at the prevention of breakdown and failures of HVAC systems. MSI Mechanical wants to help prevent the failure of equipment before it actually occurs.

Preventative maintenance is performed on roof top units, furnaces, air conditioners, refrigeration, water heaters, air handlers, chillers, pumps, humidifiers, and indoor air quality systems. Preventative maintenance activities include equipment checks, partial or complete overhauls at specified periods, oil changes, lubrication, and etc. In addition, MSI Mechanical technicians can record equipment deterioration so they know to replace or repair worn parts before they cause system failure and downtime.