Heating & Cooling SPECIALIST

O'Connor Group with O’Connor Company, G & R Controls and Balancing Professionals has offices in Sioux Falls, Rapid City, Fargo and Bismarck. Our divisions work together with mechanical contractors, engineers and building owners of the commercial and institutional markets to make the complexity of indoor comfort systems as seamless as possible. Each company has its strengths. Whether working with HVAC equipment, building automation, temperature controls or testing and balancing systems, we are committed to "Creating Customers For Life" by providing you with the best value from your heating, ventilation and air conditioning systems.

O'Connor Company

Founded in 1970, we continue to operate under two basic principles, comfort and service. We specialize in commercial heating, ventilation, and air conditioning (HVAC) equipment and offer fully stocked warehouses with knowledgeable staff to help you.

G & R Controls

We have been providing automatic temperature controls, energy management solutions, security systems, hydronic heating and cooling equipment, replacement parts and pumps and on-call emergency service support since 1977.

Balancing Professionals

To expand services building owners and engineers seek, Balancing Professionals was established in 1993. As an independently owned and operated third-party service, we provide reliable NEBB-Certified testing and balancing for any HVAC system.
 
“When we completed an $11 million building and remodeling project at St. Mary’s Healthcare Center Balancing Professionals did our air balancing. They did an outstanding job and were very knowledgeable and detailed in their work. They took the extra time and assisted other trades when problems came up. I would highly recommend them for any construction project.” 
Bruce Fossen
Plant Operations Manager
St. Mary’s Healthcare Center
Pierre, SD