Donnelly Mechanical Corporation

Donnelly Mechanical Corporation Donnelly Mechanical is New York City’s premier provider of innovative commercial HVAC service, mainte With offices across the U.S.

Donnelly Mechanical is New York City’s premier provider of innovative commercial HVAC service, maintenance and construction. With over 30 years’ experience and 200+ employees, we serve New York City’s most prominent commercial organizations across a variety of sectors including data centers, healthcare facilities, Class-A office spaces and commercial real estate management firms. In August of 2018

, Donnelly Mechanical was acquired by ENGIE, a global energy and services group. The acquisition provided us access to a wide range of new resources including a much larger capital base. These resources have allowed us to offer a broader level of service beyond the typical scope of work including project funding and energy management solutions. In July of 2021, ENGIE announced the launch of a new global business line called EQUANS. EQUANS companies are leaders in mechanical and electrical construction, industrial and energy infrastructure, and building services across North America. The entities that make up EQUANS North America include a collaborative group of commercial infrastructure experts that support clients to optimize their energy use and efficiently run their facilities. and Canada, our organization offers a rare combination of wide territorial reach and proven local expertise.

We’re always grateful to hear from our customers. ⭐Thank you for taking the time to share your experience and for trusti...
09/11/2026

We’re always grateful to hear from our customers. ⭐

Thank you for taking the time to share your experience and for trusting the Donnelly team!

09/09/2026

Fresh air and exhaust systems are easy to overlook, but they play an important role in how a building operates.

Arthur Vanderpool, our Maintenance Assessment Specialist, takes a closer look at how air moves in and out of the building and why both systems need to work together.

It’s another part of understanding the full HVAC system before our team makes recommendations. ✅

Fall is around the corner. 🍂Now is a good time to check your HVAC system, catch small issues early, and make sure your b...
09/07/2026

Fall is around the corner. 🍂

Now is a good time to check your HVAC system, catch small issues early, and make sure your building is ready for the seasonal change.

Humidity can have a bigger impact on commercial buildings than you might think.When levels are too high or too low, it c...
09/02/2026

Humidity can have a bigger impact on commercial buildings than you might think.

When levels are too high or too low, it can affect occupant comfort, indoor air quality, HVAC performance, and even energy use.

For NYC facility teams, understanding how humidity affects building systems can make it easier to spot potential issues before they become larger problems.

Read the full blog to learn what to watch for and why humidity control matters in NYC commercial buildings. https://tinyurl.com/rzpkax7a

08/31/2026

When your HVAC goes down, you know who to call. 👀🔦

Keeping NYC comfortable may not come with a cape, but it does take the right team behind the scenes.

Donnelly Mechanical is ready when your HVAC system needs us. 💪

📞 Call our team at (718) 886-1500.

Your HVAC system has worked hard all summer. A late-summer maintenance check can help catch small issues before they lea...
08/24/2026

Your HVAC system has worked hard all summer. A late-summer maintenance check can help catch small issues before they lead to bigger problems.

With a customized Preventative Maintenance Agreement, your building can:
✅ Reduce unexpected equipment failures
✅ Improve energy efficiency
✅ Extend the life of your system
✅ Stay prepared for the season ahead

Keep your building ready with a maintenance plan built around its specific needs.

Call us today: (718) 736-2571.

Poor air quality affects productivity, health, and overall comfort.Is your HVAC system keeping your air clean? Here’s wh...
08/19/2026

Poor air quality affects productivity, health, and overall comfort.

Is your HVAC system keeping your air clean? Here’s why IAQ should be a priority:
✅ Better air quality means healthier employees and customers
✅ Advanced filtration reduces airborne contaminants
✅ Compliance with IAQ standards improves efficiency and safety

Now is the time to optimize your system for fresher, cleaner air! Visit our website to learn more. https://tinyurl.com/yk2k6zex

08/14/2026

Our maintenance assessments go beyond a quick visual check.

Arthur Vanderpool, Maintenance Assessment Specialist, looks for signs of wear, damage, buildup, leaks, and anything else that could affect how the system is performing.

It’s all part of understanding the full picture before our team makes any recommendations.

Excess moisture can create major issues for commercial spaces, from mold growth to discomfort.Here’s why managing humidi...
08/10/2026

Excess moisture can create major issues for commercial spaces, from mold growth to discomfort.

Here’s why managing humidity is essential:
✅ Prevent mold, structural damage, and poor air quality
✅ Reduce strain on your HVAC system for better cooling and efficiency
✅ Protect equipment, electronics, and inventory from moisture damage

Optimize your system today! (718) 736-2571.

08/07/2026

Arthur Vanderpool, Maintenance Assessment Specialist, gives us a closer look at how a branch box helps move refrigerant from one main unit to multiple air handlers throughout a building.

It may be one part of the system, but understanding how everything connects helps our team see the bigger picture.

Address

96-59 222nd Street
New York, NY
11429

Telephone

+17188861500

Website

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