Our History

We Demand Perfection

Nelson Air Device Corp., or “Nelson Air” was established in 1931 by Nelson Blitz Sr.  Nelson Sr. specialized in the development, manufacturing, sales, and installation of a ventilator that filtered outside air for one of the first Indoor Air Quality (IAQ) means at the time. Hence, the “Device” in the Nelson Air name.  

Driven by Excellence

A decade later, Nelson Air became a window air conditioner sales and leasing company. Nelson Sr. serviced a vast amount of New York City buildings and Nelson Air continued to thrive. In 1965, Nelson Blitz Jr. joined his father in the business, and in 1967, Nelson took over the business from his father and continued to lease, sell, and install window AC units all over the city.

Continued Improvement

Changing with the times, Nelson converted the business in the late 1960’s to a full-service mechanical company that performed office renovations and fit outs. Nelson wore many hats in these days – closing work, being onsite, and performing accounting duties for the entire company. For the next 20 years, Nelson grew the business and performed work for most of the major general contractors in the city, but once again he saw a need for continued improvement. In 1989, he opened CW Sheet Metal Inc., a Local 28 Sheet Metal Shop, and began to draft, fabricate and install our own sheet metal. In 1998 Nelson Air completed our first job in the health care space and began to build a resume of work in hospitals and labs. Over the past two decades Nelson Air has become one of the largest and most relied-upon HVAC healthcare specialists in New York

Leadership & Guidance

Today Nelson Blitz Jr. and his family remain the 100% owners of Nelson Air Device Corp. and are an integral part of the business’s planning and development. Nelson’s daughter Perri joined full-time in 2023, ushering in the third-generation of ownership. Leadership and guidance remain the driving force behind our successful business.

Our current leadership takes the values set forth by both Nelson Sr. and Jr. and Nelson Air continues to be a client first quality driven full-service mechanical company that now offers construction management (CM), at risk, and design build divisions to handle any scale or complexity of project.

Executive Management

Mike Hansman
Mike Hansman

Chief Executive Officer

Tom Howard
Tom Howard

Chief Operating Officer

Scott Niemann
Scott Niemann

Executive Vice President Of Operations

Kesh Bachu
Kesh Bachu

Director of Service and Maintenance


For nine decades we have cultivated our skills, deep knowledge, and expertise. We are well-versed in a broad range of project types.


We are a hands-on management team with ownership that demands perfection.


We are proud of our long-standing reputation for delivering on-time, on budget, and to complete satisfaction.

Built on Nine Decades of Trust

Our project management team averages more than 20 years of experience in mechanical contracting and is equipped to oversee all aspects of mechanical construction, including safety, LEED, and  coordination.

Find out more

We are devoted to collaborating with our clients.

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