Expert Insight & Guidance for Commercial HVAC Issues – Rely on Donnelly’s System Analysis & Commissioning Group

Donnelly’s specialized Systems Analysis & Commissioning Group for commercial HVAC leverages decades of experience to uncover key performance issues and provide expert guidance to achieve peak performance cost-effectively.

As a result of the booming construction industry, projects are moving at an extremely fast pace. Unfortunately, this has led to a mindset to “just get it done” versus “get it done right.” Inexperienced contractors are being tasked beyond their capabilities. More and more, we are coming across HVAC systems that have been improperly installed and/or commissioned, significantly impeding the system’s ability to perform effectively and efficiently.

Donnelly’s Systems Analysis & Commissioning Group is your trusted partner to uncover the issues that are affecting the performance of your HVAC system. After a thorough analysis of the entire system, Donnelly will provide a comprehensive report of findings and recommendations that outline what’s critical now and what can be addressed over time. Our team will help you to understand how your HVAC system is performing, where the issues lie, and how to cost effectively achieve optimal performance.

Our HVAC Commissioning Services Include

Post Construction Commissioning

Commissioning HVAC systems under a year old that were improperly installed and started up by another contractor/engineering team.


Commissioning HVAC systems that are more than a year old and not running efficiently OR were never properly commissioned.
Local Law 87 (LL87) Compliance Services that include survey and analysis of energy use and ensuring correct equipment installation and performance of base building systems.

Recurring Issue Resolution

Full system inspection and analysis to identify problems that are causing ongoing issues such as comfort, airflow, sound, and performance. A comprehensive report of findings and recommendations will be provided.
Complete Indoor Air Quality testing to WELL building standards using the latest technological advancements in environmental instrumentation application software that produces LEED compliant reporting.

I would like to take the time to commend your amazing staff. I’ve had the pleasure of working with the Donnelly team on our recent move to 3 World Trade Center. I was very hesitant about working with a new mechanical contractor but I can confidently say my hesitations were put at ease immediately. The Donnelly team has taken their time to educate and guide me, and make repairs on many issues that were above and beyond their maintenance scope.  Joe, Ravi and their colleagues have shown a top notch level of expertise.  We are very fortunate to have such a knowledgeable team of HVAC technicians at our disposal.

— Facilities Coordinator Mckinsey & Company Inc.

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Commercial HVAC

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(718) 886-1500

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