Donnelly Mechanical, founded in 1989, is a commercial HVAC provider serving prominent organizations across New York City. The company's client base includes data centers, Class-A office buildings, hospitals, healthcare facilities, law firms, and financial institutions. It employs over 200 professionals and operates a fleet of more than 100 vehicles to support its work throughout Manhattan and the five boroughs.
The firm's services cover the full spectrum of heating, ventilation, and air conditioning needs. This includes new construction, routine maintenance, emergency response available 24/7, and indoor air quality solutions. It also manages specialized compliance work such as cooling tower registration and Local Law 97 adherence. Preventive maintenance programs are a core offering, designed to maximize equipment efficiency and extend system lifespans for clients.
Donnelly Mechanical maintains a focus on operational safety, a commitment recognized by the Mechanical Contractors Association of America. The company holds an Experience Modification Rate (EMR) of .66, a metric reflecting its workplace safety record.
