about.png O'Connor Group operates around three independent divisions: O'Connor Company, G & R Controls and Balancing Professionals with locations in Sioux Falls, SD, Rapid City, SD, Fargo, ND and Bismarck, ND.

O'Connor Company was founded in 1970. For nearly half a century the O'Connor Company has been rising to the challenge and meeting the demand for commercial HVAC equipment. Whether working with building owners, mechanical contractors or consulting engineers we are here to provide continued expertise coupled with quality parts and equipment.

Having foresight and vision to meet the energy needs of the future, G & R Controls began operating in 1977 and has been a leader in building automation and temperature controls. G & R Controls offers customers world class manufacturer options and a commitment to reduce energy costs and improve operating conditions.

In 1993 as the demand for high performance indoor comfort systems increased, Balancing Professionals was founded as an independently owned and operated company. Balancing Professionals offers reliable third-party NEBB-Certified air testing and balancing and keeping HVAC equipment operating as engineers intended.


          1970 -  O’Connor Company was founded

          1978 -   Rapid City (SD) Branch opens

          1993 -  Balancing Professionals, Inc. was founded

          1994 -  G & R Controls merges with O’Connor Company

          1998 -   Rapid City office builds current facility

          2000 -   Fargo (ND) Branch opens

          2005 -  O’Connor Group builds current headquarters (Sioux Falls, SD)

          2010 -   Fargo office builds current facility (Energy Star Certified)

          2013 - Bismarck (ND) Branch opens