Donnelly Mechanical Corporation

Donnelly Mechanical is New York City’s premier provider of innovative commercial HVAC service, maintenance and construction. With over 30 years’ experience and 200+ employees, we serve New York City’s most prominent commercial organizations across a variety of sectors including data centers, healthcare facilities, Class-A office spaces and commercial real estate management firms. Donnelly Mechanical is proud to be an ENGIE company. We are now part of the global community of the number one energy services provider in the world. The acquisition, which took place in August 2018, reflects Donnelly’s shared methodologies with ENGIE, where the foundation of delivering high-quality service is based on building personal relationships. With the support of ENGIE’s premier energy services and technical capabilities, Donnelly Mechanical has greater resources, allowing us to go deeper and broader into the energy needs of our valued clients.