About Us

​We are a commercial and industrial HVAC contractor serving the greater Philadelphia, Allentown, New Jersey, and Delaware regions.  
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The late Walter R. Dorn established a refrigeration appliance service company in the early 1940s, and now over 75 years later we've grown into a full scale commercial and industrial HVAC company offering an array of services. We specialize in HVAC mechanical services, installations, and ATC control systems.

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Typical Clients

•Pharmaceutical Facilities
•Cleanroom Laboratories
•Manufacturing Facilities
•University Campuses
•Commercial Offices
•Historic Buildings

Company Profile

• In House Engineering Services
• Designated Service Technicians
• Designated Controls Department
• Designated Installation Mechanics
• Certified Safety Training and Instructing
• Stocked Warehouse for Parts and Services