We Provide Solutions.
We are New York City’s premier provider of innovative commercial HVAC service, maintenance and construction. With over 30 years’ experience and 200+ employees, we serve NYC’s most prominent commercial organizations by providing innovative HVAC solutions to ensure comfort, maximum efficiency, improved indoor air quality and system reliability.
Services & Solutions
We Keep Customers Comfortable with Reliable AC Repair, Maintenance, & Installation!
Donnelly Mechanical provides custom HVAC preventive maintenance services for a distinguished clientele within many of New York City’s prestigious buildings.
Commercial HVAC Service
Our unique NYC zoning system allows our factory trained technicians to respond quickly either by van or on foot in the event there is a service-related emergency.
Replacements & Upgrades
Our technical team goes beyond the general maintenance and repair services scope. Our turn-key client direct projects range from equipment replacements to design build solutions to high efficiency system upgrades.
New Commercial Construction
From initial survey to project completion, Donnelly effectively manages even the most complex HVAC construction projects with professionalism and ease.
Indoor Air Quality Solutions
Clean indoor air is an office amenity that matters to employees. Our experts test, monitor, improve and sustain Indoor Air Quality to ensure wellbeing and productivity for you, your employees and customers
I just wanted to thank you and everyone on your team for all of your help in repairing our AC issue. This was an ongoing struggle before I joined the company, with several vendors not being able to repair the unit. Your turnaround time was so fast and efficient and I can't thank you all enough for your assistance.
Tenant at 150 Broadway Senior Manager, Facilities & Environment
Donnelly’s hospitality and care that they offer their team and clients is a model I wish others would emulate. Donnelly is a great family of SMEs and Trusted Advisors who put their clients’ needs first and builds trust like only a family can. I look forward to continuing our working partnership.
A tripped circuit breaker located in the basement on the building caused our CRAC unit to go into a High-Temperature alarm and go down. Our Donnelly technician and his field supervisor responded right away. They were the absolute best. They were in constant communication with us, keeping us well informed, and were extremely professional as always. They truly represented Donnelly and what they stand for.
Director of Business Affairs Broadway Video
CHIEF ENGINEER RXR 530 5TH AVE
I find Donnelly Mechanical to be outstanding in regards to their service department. I had a specific service coordinator that I deal with all the time. I also have a dedicated technician that has been working here for 8 years. I’m very pleased with him, he brings anything I need to know about to my attention. He’s just a phone call away and he always finds the problem and resolves it so that there are no future issues. So based on that, that’s why we continue to use Donnelly Mechanical. It’s a huge help having the same technician here every time because he knows where all the units are and I can trust that he will get the job done efficiently. When Hurricane Irene came, they called us up to actually see how we were doing… they were there to help us if we needed storage space or any other kind of assistance. We didn’t even have to call them, they showed concern for their client. That was very impressive.
KIRKLAND & ELLIS 601 LEXINGTON AVENUE
The technicians are knowledgeable and professional which is very important to us. They get right to work and don’t waste any time. When I call Donnelly, they’re here within the hour. Before, I had to wait 5 to 6 hours and it took 3 visits before they were able to fix the problem. Donnelly does it in one. I do a lot of networking and deal with a lot of facilities managers and everyone says how Donnelly is one of the best companies out there. You can see it – their trucks are all over. When I ask people, who’s your air conditioning provider, they all say Donnelly. It’s not often that at a big company like this you get to speak with the owner one-on-one. That’s something that is very good to have. Dino will be more than happy to come down, shake your hand, have a cup of coffee with you. And that’s great.
JWT 466 LEXINGTON AVENUE
Distinguished Maintenance Clients throughout NYC
EMR (Experience Modification Rate)
Over 30 Years of Outstanding Service
NYC UVGI System
Donnelly Mechanical worked to provide a safe working environment for industry employees by installing a duct-mounted UVGI system on each office floor.All Case Studies
With a fast-paced timeline, Donnelly replaced Loro Piana’s existing heat pump VRF system with an updated higher efficiency heat recovery VRF system.All Case Studies
Long Island Healthcare Facility
With a brand new laboratory facility being constructed, new mechanical equipment was required. This included everything from new chillers, boilers, fan coil units, & custom AHUs.All Case Studies
The base building’s existing steam absorption chillers, which provide the large tonnage central air conditioning, had served beyond its useful life and needed to be replaced.All Case Studies
Basketball City is a 70,000 sq. ft. “state-of-the-art” Sports & Entertainment facility, Donnelly Mechanical helped identify ongoing issues with their HVAC equipment that included poor performance and premature equipment failure.All Case Studies
Stay Up to Date with HVAC
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Make the Switch
Our contract transition team makes is easy to become a preferred maintenance client.