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We provide commercial HVAC services including preventive maintenance. emergency repair service, equipment replacements & upgrades, indoor air quality solutions, and new construction

Yes. We are a union shop employing over 100 employees’ part of Local Union 63

We cover the metro New York area including New York City, Westchester, Long Island and Northern New Jersey

Healthcare and life science facilities, Class-A office spaces, data centers, schools, universities, industrial facilities, and base building.

Our team of project managers oversee all types of mechanical construction projects from Plan and Spec to Design-Build to Comprehensive Turn-Key projects. Regardless of the project delivery method, our team is experienced in all aspects of commercial real-estate construction including Core and Shell, Fit-Outs, and Overbuilds.

Our current EMR is .63, well below the industry average.

Yes. We are a qualified vendor within the SCA vendor system.

Yes. Donnelly is certified through ISNetworld®, which is a is a third-party system that verifies contractors’ safety compliance data to qualify them to work with various clients who require an ISN® certification.

Donnelly Mechanical Corp. is an indirect, wholly-owned, subsidiary of Equans U.S, Inc., which in turn is part of the global Equans group.

Donnelly maintains its status as an independent entity operating within the New York City market. Benefiting from the robust financial support of the Equans group on a global scale, Donnelly demonstrates remarkable financial strength and stability.