With our real focus on customer satisfication, you can rely on us for all of your commercial HVAC service needs

  • HVAC Emergency Service

    Available 24 hours a day, 365 days a year
    Call us now: 1-617-268-8775

  • Turnkey HVAC Installation & Replacement

    Replacement and retrofit projects are handled professionally by experienced managers and field personnel. Communication is always a priority at MMS, 100% customer satisfaction is always our mission.

  • Multi-year Preventative Maintenance Agreements

    Custom designed preventive maintenance programs are designed to meet our customers' budget and extend the useful equipment life of their HVAC + R systems. Lead technicians are always assigned to our service contract customers. This insures that communication and continuity between MMS and our customer is always maintained.


Millennium Mechanical offers exceptional customer service and expertise in the repair, overhaul, maintenance and replacement of HVAC and refrigeration systems. For nearly two decades, we have evolved as an industry leader in the design and installation and service of all types of commercial HVAC systems. Our goal is to delight our customers in every interaction with our company.

We are committed to training our employees, equipping them with the tools and knowledge to stay on the leading edge of technology in our industry. Our technicians are on-call 24/7 for emergency repairs. Our service professionals are available to design, install and service all types of HVAC and Refrigeration equipment. We also provide multi-year custom-tailored maintenance programs designed to meet the needs of your facility.


    We combine quality workmanship, superior knowledge and competitive prices to provide you with service unmatched by our competitors.


    We have the experience, personnel and resources to make your HVAC and refrigeration projects run smoothly. We can ensure a job is done right and on time.


    All of our service technicians are fully licensed and insured exceeding typical industry minimum requirements. The business meets all workman’s compensation and liability insurance requirements necessary to support our wide variety of customers.

  • SINCE 1997

    Founded by Walter Mahoney and John Lamb in 1997, Millennium Mechanical Services provides HVAC services in the New England region with our focus in the greater Boston area. Personal, professional and experienced ownership support our field personnel every day. Quick service response and problem solving capability separate Millennium Mechanical from the competition.


  • New Balance
  • Grill 23
  • Newbury Comics
  • DHL
  • Blue Cross Blue Shield of Massachu
  • US Army
  • The Cheesecake Factory
  • The Commonwealth of Massachusetts
  • 840 Summer St.
    Boston, MA 02127

© Copyright 2016 Millennium Mechanical Services, Inc.