Commercial HVAC Preventative Maintenance in New York City

Commercial HVAC Maintenance Service with a Facilities Management Focus

Proven Zoning System And Rapid Response Times

Donnelly Mechanical provides custom HVAC preventative maintenance services 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 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.

Commercial Preventative Maintenance not only extends the life of your equipment, but saves you money! We understand your budget is important and that’s why we’ve been serving clients for over 30 years as their trusted provider for Commercial HVAC Preventative Maintenance in NYC.

24/7 Emergency HVAC Repair Service & Support

Unique NYC Zoning System

Over 100 Vehicles Ready to Dispatch

30+ Stationary Techs


HVAC Maintenance

Talk With Us,

Call Donnelly Mechanical at (718) 886-1500 today.

Fast Response and a Worry-Free Resolution

30 Years of Contract Transition

Our Customized HVAC Preventative Maintenance Programs Offer The Following Benefits

Donnelly Client Portal Makes Service Requests Easy As 1, 2, 3

No more service request emails or phone calls required.

client portalTo expedite the service scheduling process, Donnelly clients are now able to make and review system maintenance service requests simply by logging on to their Donnelly Client Portal from their desktop or mobile device!

As Simple As 1, 2, 3

A convenient, central place to manage their maintenance needs and records, the Donnelly Client Portal maintains a comprehensive record of all preventative maintenance services.

Always focused on providing our distinguished clientele with best-in-class service, the easy-to-use Donnelly Client Portal is one more benefit of choosing Donnelly Mechanical as your Preventative HVAC Maintenance service provider.

Are you an existing Maintenance Client?


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.


Donnelly provides you with a dedicated technician who will develop an extensive understanding of your system and provide you with the personalized technical support and information you require.

Comprehensive Analysis of Equipment

We'll provide you with a full audit and report of your Commercial HVAC Systems


Receive preferred labor rates and priority response to emergency calls

Client Portal

Place service calls from anywhere - including your computer, phone or tablet!

Quality Control

We conduct inspections to enhance and improve our valued clients comfort experience.