Donnelly Mechanical Corporation

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.

We Are the Most Reliable Mechanical Contractor in New York City.

We give our clients peace of mind. We do this by providing the most innovative services and solutions through our experienced team.

We schedule all equipment replacement and maintenance services to ensure your day-to-day business is not affected.

Donnelly Mechanical provides a maintenance transition plan and team to reduce the risks inherent in change. 

Our Services & Solutions

We Keep Customers Comfortable with Reliable AC Repair, Maintenance, & Installation!

• Preventive Maintenance: It does not only extends the life of your equipment, but saves you money, giving you a better return on your investment. Performing regular maintenance on your Commercial HVAC system also increases energy efficiency.
• Indoor Air Quality: We test, monitor, improve and sustain Indoor Air Quality to ensure wellbeing and productivity for you, your employees and customers.
• Commercial HVAC Services: Donnelly’s field service technicians have the skills and expertise to give you fast, worry-free resolutions to any commercial HVAC problem.

• Replacements and Upgrades: Donnelly Mechanical’s is committed to delivering intelligent HVAC solutions and upgrades. We provide support and resources for mechanical systems that are above and beyond the general maintenance and repair services scope.

From initial survey to project completion, Donnelly effectively manages the most complex HVAC construction projects with professionalism