Deljo Heating and Cooling has upheld a tradition of HVAC excellence that began in Chicago in 1922. Our 90-plus year history in the local heating and cooling industry has provided two generations of Chicagoland residents and business owners with the high-quality HVAC products and services that have kept them comfortable through the extreme temperatures of our winter and summer seasons. This 90-year legacy attests to the extensive experience, sheer determination, uncompromising commitment and unceasing quest for excellence that have built this company into the successful enterprise it is today. Our decades of experience in the field are your assurance that we will always be here to provide superior HVAC service whenever you need us.


Early Years

Deljo’s legacy began when its forebear, Del-Nard Fuel Oil, first set up shop in 1922. Offering complete furnace cleaning and repair services throughout the Chicago area, the company quickly made a name for itself through exceptional customer service and continued to serve the heating needs of its Chicagoland neighbors for the next 60 years, effectively setting the stage for Phase 2 of the brand’s evolution.

Recent History

In the early 1980s, Bob Clement came into the picture, purchasing the highly respected company and taking the helm. The small five-man operation continued the tradition of excellent service that had marked the Del-Nard name over the years. Sometime later, Bob Clement invited his brother Bill on board, and with the team-up, the business flourished. The joint venture that became a cooperative effort between the two Clement brothers gradually grew into the large family-run operation that Deljo Heating and Cooling has become today. The company’s early legacy had provided a solid foundation on which to build — and perfect — the necessary mix of HVAC expertise and personalized service that have since come to characterize the Deljo name.

Into the Future

As the company looks toward the future, the brothers who lead it see even greater change and innovation ahead — and with them the opportunity to make the most of emerging new technologies to continuously improve their operation, taking both customer comfort and personalized service to a brand new level.

Deljo:Creating History Every Day

As the Deljo team leaves the office each morning, each technician views their appointments as a new opportunity to build an ongoing legacy of quality through their work. By honing and using their skills to the best of their ability, providing the quality HVAC service that every customer needs, Deljo’s team helps the company create a small piece of history every day.