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 • 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