National Mechanical Services

National Mechanical Services has been in business for 25 years servicing all of its commercial and industrial customers on a 24-hour basis.

We pride ourselves on the quality of our service, along with a response time of four hours or less.

Our service technicians are fully licensed, with both EPA and Massachusetts’s licenses.
We are also factory trained for a wide range of products.

The services provided by NMS are as follows:

• 24 hour HVAC (Heating, Ventilating, and Air Conditioning)and Refrigeration service
• Service on all refrigeration equipment with fluorocarbon refrigerant to unlimited horse power
• Preventative maintenance services
• Process cooling equipment 300 tons and under
• All types of environmental chambers
• Ductless air conditioning and heat pumps
• Computer room equipment
• Building air conditioning equipment including BMS systems in concert with O’Leary Energy Controls
• Installation of all equipment serviced
• Cold storage facilities
• Ice Machines
• Vacuum cooling
• And More

  • 24 Hour Refrigeration Service

    24 Hour Refrigeration Service 781.662.8689

    With National Mechanical Services on your side you can rest assured that your HVAC and Refrigeration systems are in good hands. Our fully licensed service technicians are available 24 hours a day, 7 days a week. We understand the needs of our customers and we strive to exceed their greatest expectations!

  • Service and Maintenance

    Service and Maintenance

    The Service Technicians at National Mechanical Services are experienced and very well trained in maintaining, repairing and installing all types of commercial HVAC and Refrigeration equipment. We are fully licensed and remain current on new HVAC and Refrigeration equipment and technology.


  • Installation


    Our installation technicians are experienced and well trained in the installation and replacement of all types of HVAC and Refrigeration equipment. Whether your looking for new installation or to replace existing equipment we've got the experience and knowledge to get the job done right!


  • Request a Quote

    Request a Quote

    Are you looking for a Quote for and upcoming commercial or industrial job? Follow the link below to make your request by email or you can contact one of our representatives by phone right now. (781)995-2343 Request Quote...