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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.


Image from the Hartford 21 Energy project

Hartford 21 chose NEMSI to create a solution that will get them off of the city's central 'energy loop.' The solution included a new central plant, building controls, and cooling tower, and will generate $1M in annual energy savings.

Watch the video.

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.