Let Us Solve Your Biggest HVAC Headache
When a commercial HVAC issue comes up in New York City, the most challenging part is often knowing what to do next. Is it a one‑time service call, a larger repair, a capital project or a sign that ongoing maintenance needs to be addressed?
That’s where Donnelly Mechanical makes it easier. New prospects can speak directly with a skilled HVAC technician to walk through their issue, review system conditions, and get informed guidance right away. From there, we help determine the most effective path forward. Whether that’s dispatching a service technician, involving a project manager for more complex needs, or identifying opportunities for regular preventive maintenance to avoid repeat issues altogether.
We support commercial HVAC repair, troubleshooting, ongoing maintenance programs, and system upgrades across NYC. By starting with a technical conversation upfront, we eliminate guesswork, reduce delays, and move you from uncertainty to a clear, proactive plan.
Tell Us Your Biggest HVAC Challenge
Speak Directly with a Skilled Technician
A Smarter, Streamlined Experience
Have a Commercial HVAC Issue? Text Us or Ask Us
Not sure who to call or what the issue really is? Start with a conversation. Fill out the form below or text us at 718-886-1500 to connect with our team. If it’s a strong fit, we’ll connect you directly with a NYC-based HVAC field supervisor who understands complex building systems. They’ll ask a few technical questions, help diagnose the situation, and recommend the right path forward, whether that’s immediate service, deeper troubleshooting, or a larger capital project.
Why Choose Donnelly Mechanical?
Our team has built its reputation on decades of trusted service and real-world expertise. With over 30 years in the commercial HVAC industry, we bring highly trained, innovative technicians to every service call, ensuring your system gets the attention it deserves, whether it’s routine maintenance, complex repairs, or urgent issues that can’t wait. Our technicians not only diagnose issues quickly but also communicate clearly so you understand the work being done.
From energy‑efficient solutions and indoor air quality improvements to emergency support when you need it most, our commitment to excellence means you can have confidence that your comfort and system performance are in capable hands.
30+ Years of Industry Leadership
Trusted by NYC’s top businesses for reliable HVAC solutions.
Certified & Experienced Technicians
Trained in the latest industry standards and technologies.
Customized Installations
Solutions tailored to your building’s size, usage, and energy needs.
Regulatory Compliance & Safety Focus
Ensuring adherence to Local Law 97, ASHRAE, and EPA standards.
Get in Touch