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Single-Source Mechanical & Facilities Solutions For High Performance Environments

For over 50 years, clients across Connecticut and the Northeast have counted on NEMSI to deliver end-to-end facilities solutions for their various building environments. NEMSI builds and installs the critical systems to help ensure clients’ facilities are consistently comfortable, productive, and profitable.


technician servicing HVAC equipment

Prepare now for the Department of Energy's 2023 HVAC Minimum Efficiency Standards. We can help you assess your equipment and develop a plan.

Learn more.


Four NEMSI employees wearing safety gear.

Our employees help make a difference in building environments and workplaces of customers every day across the region. We have many rewarding career opportunities available.

Join our team.

Meet the Team

Russell Stevens bio pictureRussell Stevens, President & CEO, is just one of the many people that allow our clients to better manage tomorrow's buildings today.

Meet the rest of our team.