Who is Donnelly Mechanical?



Donnelly is the most reliable mechanical contractor in New York City.



Donnelly Mechanical is New York City’s premier provider of HVAC service, maintenance, and construction, as well as energy solutions. When you entrust Donnelly Mechanical with your HVAC and energy service needs, you align with more than 1,700 companies who value their hallmark of direct owner access at every level. Their customized maintenance and service agreements are tailored to your company’s unique needs. They are specifically designed to ensure peak operating efficiency, minimize equipment downtime and eliminate the need for repeat visits.

What is the Donnelly difference?



Donnelly Mechanical gives their clients peace of mind. They do this by providing the most innovative services and solutions through their experienced team. Donnelly Mechanical values clients, integrity, innovation, and employees.



Donnelly Mechanical understands the difficulty of changing maintenance vendors. Reducing the risks during these transitions saves time and makes it easier to make a switch if you’re unhappy with your current service provider. During the transition process, the Donnelly Transition Team familiarizes themselves with your building’s entire HVAC system. This ensures consistent, cost-effective service at every point of contact thereafter. All technicians undergo a rigorous training program that equips them to service and maintain systems with the utmost care and confidence. They provide a maintenance transition plan and team to reduce the risks inherent in change.



Donnelly Mechanical schedules all equipment replacement and maintenance services to ensure your day-to-day business is not affected. You can trust their expert technicians to answer your queries, respond quickly and provide consistent service around the clock. Their customized maintenance and service agreements are tailored to your company’s unique needs.