Providing Commercial HVAC Service & Installation to Boston and New England since 1992


USI is capable of providing your commercial and industrial service needs including:
  • Air Conditioning / Ventilation / Heating
  • 24/7 Emergency On-Call Technicians
  • Troubleshooting and Diagnosis
  • Chiller Services (Centrifugal / Absorption /Direct Expansion)
  • Refrigeration
  • Equipment and Site Survey



USI provides customized preventative maintenance agreements to meet your needs on:
  • Chillers & Cooling Towers
  • Rooftop Packaged Equipment
  • Boilers & Furnaces
  • Heat Pump & Split Systems
  • Fan Coil Units
  • Spring Startup & Winter Shutdown
  • Site Specific Customized Planned Maintenance Programs


USI also specializes in new installations from small to large and everything between:
  • Unit & System installations
  • Conceptual Design & Build Installations
  • Plan & Specification Projects
  • Project Management
  • Estimating
  • Value Engineering

Questions, Comments?

If you have any questions about our company, products or services, please feel free to
call 978-667-8800, Mon-Fri 7:30am-4:30pm.

Or Contact Us Via Email

Emergency Service:

For USI’s 24 hour emergency service, call:


Customer relationships are the key to our past, present & futures success.

USI specializes in providing the finest in building comfort services and minimizing downtime in HVAC systems. USI is recognized for our record of on-time response, knowledgeable field representatives, state-of-the air equipment and competitive pricing.

USI services and works with many of New England’s top-tier property management companies. We manage everything from simple repairs, evaluations and diverse installations to some of the most demanding design and build systems. In addition, we service and install HVAC equipment from all manufacturers. USI also has the capability to provide a customized preventative maintenance plan within your budget requirements without jeopardizing the level of diligence and care your equipment receives.