New England Mechanical Services, Inc. (NEMSI) was founded in 1966 in Vernon, Connecticut as a HVAC service organization. We have evolved from primarily an HVAC service company to become a fully diversified, total facilities services provider. We have over 420 employees, 50 years of experience, and the ability to carry out jobs of virtually any size and complexity.

2016 - NEMSI Celebrates 50-year Anniversary 
2015 - NEMSI services expanded to cover Vermont, Maine, and New Hampshire 
2014 - Manchester, NH branch office opened.
2012 - Certified Energy Managers and Registered Professional Engineers added to staff 
2011 – Tri-Tech, Albany, NY joins NEMSI.
2011 – NEMSI Celebrates 45 Years in Business.
2009 – Automation Group expanded to include Energy Services & Advanced Building Technologies.
2008 – Acquired New England Sheet Metal, Shelton, CT, and Comfort Systems USA, Hartford, CT branch.
2007 – NEMSI expands their capabilities in their Mechanical Group, completing several major construction projects in the Hartford Market. 
2002 – EMCOR Group, Inc. acquires CES.
2001 – Pawtucket, RI branch office opened.
1999 – Merged with Consolidated Engineering Services, Inc. (CES).
1997 – Springfield branch office relocates to Palmer, MA.
1996 – Electrical Group added.
1992 – Trumbull, CT branch office opened.
1989 – Building Automation Systems Group added.
1987 – New London, CT branch office opened.
1985 – Springfield, MA branch office opened.
1973 – Construction Group added.
1966 – NEMSI begins operations.

Even though we are part of EMCOR Group, Inc. (a Fortune 500 company), NEMSI continues to be the same locally managed and operated company who has been successfully meeting the business needs of our clients since 1966. More importantly, we are an organization providing exceptional value to our clients through quality people who are proud to be a part of the NEMSI organization.