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Our Services

  • Commercial HVAC Preventive Maintenance
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  • Commercial HVAC Construction
  • Turn-Key/Single Source Projects
  • Refrigerant Conversions (R-22)
  • Tenant Fit-Out Contractors

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What Our Clients Say

A tripped circuit breaker located in the basement on the building caused our CRAC unit to go into a High-Temperature… “Broadway Video”

Director of Business Affairs
Broadway Video
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The technicians are knowledgeable and professional which is very important to us. They get right to work and don’t waste… “JWT Testimonial”

JWT
466 LEXINGTON AVENUE
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Every year we bring Donnelly in to do a full diagnostic survey of all the equipment and then we make… “17 STATE STREET”

BUILDING MANAGER
17 STATE STREET
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We retained Donnelly Mechanical to provide a turn-key replacement of obsolete air handlers. We provided the basic performance specifications we… “RXR 530 5th Ave NYC Testimonial”

CHIEF ENGINEER
RXR 530 5TH AVE
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I wish to thank Donnelly Mechanical for the installation of our brand-new air conditioning equipment. Throughout the entire six-month process,… “THE TOWN HALL FOUNDATION”

THE TOWN HALL FOUNDATION
EXECUTIVE DIRECTOR
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Donnelly’s hospitality and care that they offer their team and clients is a model I wish others would emulate. Donnelly/Engie… “BlackRock”

Director
BlackRock
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Replacing our chillers was a big decision that required detailed planning. Donnelly’s BIM capabilities were a real asset, providing us… “BOSTON PROPERTIES”

CHIEF ENGINEER
BOSTON PROPERTIES
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As a 35 year veteran within the commercial building industry, I’ve had the pleasure of working with Donnelly Mechanical on… “SILVERSTEIN PROPERTIES”

CHIEF ENGINEER
SILVERSTEIN PROPERTIES
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During the chaotic turn of events following the blackout on Saturday, July 13th, our 100 W 33rd Street building was… “NYC – FCB Blackout Testimonial”

Manager, Facilities & Services
NYC - FCB
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I find Donnelly Mechanical to be outstanding in regards to their service department. I had a specific service coordinator that… “KIRKLAND & ELLIS, 601 LEXINGTON AVENUE”

KIRKLAND & ELLIS
601 LEXINGTON AVENUE
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I would like to take the time to commend your amazing staff. I’ve had the pleasure of working with the Donnelly… “Mckinsey & Company”

Facilities Coordinator
Mckinsey & Company Inc.
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96-59 222nd Street | Queens Village, NY 11429 | Tel: 718-886-1500