Preventive Maintenance HVAC Service Customized to Your Needs

Commercial HVAC Service with a Facilities Management Focus

Donnelly Mechanical provides custom HVAC preventive maintenance service for a distinguished clientele within many of New York City’s prestigious buildings and institutions.

Our goal is to ensure efficient and continued operations of all your HVAC systems, including server room air conditioners, for the ongoing comfort for your tenants and uninterrupted operation of mission critical systems. Our hands-on approach allows us to be easily accessible when you need us most and ensures your peace of mind.

How Donnelly Mechanical Benefits You:



We understand the difficulty of changing maintenance vendors. During this process, our team familiarizes themselves with your facility’s entire HVAC system. This ensures consistent, cost-effective service at every point of contact thereafter while integrating your site into our Service Division.


Security is an important facilities concern. Donnelly provides you with a dedicated team of technicians who will develop an intimate understanding of your system and provide you with the personalized technical support and information you require.


We conduct inspections to enhance and improve our valued clients comfort experience. In addition to our regular maintenance inspections, we review sites annually from a different viewpoint to ensure that we are providing the best possible service both today and tomorrow.


To allow you to be as hands-on as we are, we provide you with access to a secure web-based logging system to track your HVAC service and maintenance history, making it easy for you to generate reports when needed.


Whenever you need an immediate resolution to a problem, a Donnelly owner is available 24/7 to help you.

Donnelly Technician

Donnelly Mechanical commercial HVAC service technicians working on a Carrier HVAC unit in a New York City building.
Every year we bring Donnelly in to do a full diagnostic survey of all the equipment and then we make adjustments. Since the relationship started in 2002, we have not had a machine down.
– Building Manager, 17 State Street, Manhattan

John Fallon

Need more info?

Contact your hands-on Project Owner now!


Need more information? Call Donnelly Mechanical at (718) 886-1500 today.

Fast response and a worry-free resolution – that’s The Donnelly Difference.