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About Us
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Employee Portal
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Thank you for contacting us. We will be in touch with you shortly. If your need is urgent, please call 605-336-3788.

Headquarters 4909 North Lewis Avenue, Sioux Falls, SD 57104 (605) 336-0333
Fargo, ND 5425 51st Avenue South, Fargo, ND 58104 (701) 237-3763
Rapid City, SD 1221 Concourse Drive, Rapid City, SD 57703 (605) 348-2033
Bismarck, ND 2910 East Broadway Avenue, Suite 19, Bismarck, ND 58501 (701) 751-4870

Learn More About G&R Controls

G&R Controls delivers high-quality HVAC products and services that help customers manage comfort and energy across diverse facilities. G&R's partnership with Siemens provides access to cutting-edge technology and resources to achieve optimal building performance.
Learn More About 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.
Learn More About 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.

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