Established in 1974, ESI is a Full-Service Mechanical & Engineering firm specializing in HVAC Systems and Service.

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ESI Engineer LEED Certified
ESI Opens Chelmsford Satellite Office

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ESI - New England's Premier HVAC Company
In ESI's first 35 years, our firm completed more than 10,000 commercial projects, including corporate office buildings, warehouse, distribution facilities, advanced technology - Clean rooms, USP 797 rooms, Bio/Pharma Labs/Suites, Data Centers and Semiconductor/Electronics facilities.

ESI is one of the few mechanical firms to have developed the specialized expertise required in today’s modern facilities and “greener”, more energy efficient buildings and systems.

Typically, we work with clients from the outset of a project’s conceptual phase, designing systems that meet both program and budget criteria.

ESI offers customers a full Range of Service:

- Preconstruction/Construction

- In-House Engineering/LEED Certification

- HVAC Controls Department

- Sheet Metal Fabrication Shop/cGMP Protocols

- Start-Up/Commissioning Department

- Service Department - Ongoing Maintenance/24 hour Coverage

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