Leading Team of Certified HVAC Technicians Ready to Diagnose and Resolve Your Commercial HVAC Issues

Donnelly’s field service technicians have the skills and expertise to give you fast, worry-free resolutions to any commercial HVAC problem.

Donnelly’s professional staff of licensed and certified technicians  arrive in uniform and with proper identification to ensure the safety of your building and its occupants. Choose the best Commercial HVAC Repair Service in NYC. Learn more about why Donnelly Mechanical is the premier provider for HVAC Repair Service  in New York City here.

How Donnelly Mechanical Benefits You

Rapid Response Time

From complete system failure to restoring optimal system performance, our emergency service team will get your HVAC systems up and running so you can get back to business. We are available 24 hours a day, 7 days a week, 365 days a year. Around the clock, we maintain a full emergency service crew, including supervisors and technicians.

Unique NYC Zoning System

Ensuring prompt response when you need it most, Donnelly dispatches our certified technicians according to a strategic zoning system throughout Manhattan. Along with a fleet of more than 100 branded service vehicles and over 30 on-foot technicians, our typical response time is among the fastest in the industry, allowing us to resolve your emergencies quickly and efficiently.

Manufacturer Certified Technicians

Our staff is trained and certified to work on all major manufacturers’ lines of HVAC equipment. In addition to these certifications, ongoing trainings are required for all staff to maintain and increase technical expertise in our industry.

Executive Involvement

Donnelly understands the importance of having access to the top, which is why our executive team is always available to help you with your Commercial HVAC Repair needs when you require resolutions as quickly as possible.

Commercial HVAC Industries We Serve

Business Commercial HVAC

Custom HVAC repair and maintenance services for NYC businesses deliver quantifiable cost savings.

Read More

Data Center

Increased efficiency and reliability for mission critical data center and IT systems.

Read More

Financial Industry

CRAC unit reliability and efficiency for New York City’s financial sector.

Read More

Healthcare Facility and Hospital

Expert healthcare facility and hospital HVAC repair and maintenance services customized for your facility’s unique needs.

Read More

We retained Donnelly Mechanical to provide a turn-key replacement of obsolete air handlers. We provided the basic performance specifications we needed for the areas the equipment would serve and they did the rest from shop drawing to unit commissioning. They acted as general contractor and retained the services of all trades necessary to execute the work. Existing chilled water and steam risers required modifications as did electrical infrastructure. The project manager was present every day that work took place. He provided daily briefings on progress. Every aspect of the project was meticulously planned. The equipment being replaced was the original and thus this project presented challenges that were not a factor at the time of original installation. Everything had to fit within confines of mechanical rooms and provide adequate clearances as necessary for persons to work. I have heard tales of woe about equipment arriving at loading docks and then not fitting in the elevator, not fitting through the door, not making the turn, etc. Donnelly brought a representative from the equipment manufacturer to the site to walk the route from the street to the mechanical room so that every doorway, corridor, elevator, turn, etc was accounted for and thus there were no logistical issues that often arise in a large-scale project. All tradespersons displayed professionalism throughout and were very respectful of the property.