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About PDM Group

PDM Group has a proud company history dating back to 1935. One of our Founding Companies, Hearnen Air Conditioning was one of nine original Factory Distributorships set up by Willis Haviland Carrier, an American engineer, best known for inventing modern air conditioning. Carrier invented the first electrical air conditioning unit in 1902. We have grown in to a leading Industrial and Commercial Air Conditioning Heating and Ventilating Service Provider. Our business was founded on responding quickly to our customer’s needs, delivering good quality service at a reasonable price and producing a positive result for our customers. We now have two offices with fully staffed Service Departments. Our main office is located in Cranbury, NJ covering nyc and the surrounding area. Our Annapolis, Maryland Office covers Metro Washington, DC and Northern Virginia. Our Engineering and Installation Department specializes in Design Build Applications from the simplest to the most complex including air conditioning, heating, piping and process systems guaranteed to meet your specifications.

PDM Group provides, installs and services all major brands of HVAC Equipment including Process and Comfort Chillers. Process Chillers, and Cooling Towers for the Plastics Industry and specialty equipment such as Desiccant Dehumidifiers for the Food, Pharmaceutical and Process Industries as well as Humidification Systems and Data Center Cooling Equipment. We also specialize in the design and installation of Direct Digital and Pneumatic Control systems, including Building Automation.
We set high standards for all our employees and sub-contractors. Their attitudes and skills are expected to reflect our company’s commitment to exceed your expectations in everything we do.


PDM Group is comprised of a Management Team with over 75 Years of experience in the Industrial, Commercial Heating, Air Conditioning and Piping fields.

PDM Groups Service Departments are comprised of competent Full-Time Staff Including:

P.E. Vice President of Engineering

Fred Missel

Service Manager

Keith Gulick

Service Coordinator

Angela Covington

ALL HVAC Service is scheduled through an industry specific Software Package that tracks all service calls, related parts and labor. This allows for accurate and timely invoicing

PDM Group provides service 24/7, 365 days a year, including Holidays. After hours Emergency Service id addressed through our phone system which will put any customer in need of service directly in touch with an on-call Technician.

The owners of PDM Group are directly involved in the day to day operation of our Company in the office and out in the field.

PDM Group is committed providing our services with “SAFETY” being of paramount importance. This includes the cooperation and support of our Employees, our vendors and Sub-Contractors. All our Technicians are 30 Hour OSHA Trained and have had confined space training. A number of our personnel have also qualified as a crane signal and voice command person.


Pharmaceutical Production

Hospitals / Healthcare Facilities


Universities & Schools

Industrial & Chemical Plants

Hi-Tech Clean Room Manufacturing

Data Centers

Commercial Office Buildings