Our companies provide commercial, industrial, and institutional HVAC, mechanical, refrigeration, controls & automation, and plumbing services all throughout the United States. These companies are among the best service providers in each of their markets and continue to grow by taking care of their employees and customers every day.

Since 2021, the Kelso Industries team has completed twelve acquisitions and now Kelso has businesses headquartered and operating in Arizona, Idaho, Utah, California, Georgia, Florida, North Carolina, Delaware, and Pennsylvania. Below please read more about eight of our partner companies.

GRAZAK Mechanical is based in Phoenix, Arizona and has been serving builders and property owners in Arizona and other surrounding states since 1961. GRAZAK fabricates and installs complex sheet metal ductwork systems as well as installs industry leading HVAC equipment brands and system for retrofit situations, new construction, and service projects. GRAZAK has more than 120 HVAC professionals on staff and is helping to provide cool, clean air to customers every day.

Advanced Heating & Cooling is based in Boise, Idaho with a regional office in Salt Lake City, Utah. Advanced has become a leading HVAC provider for commercial and residential customers. Advanced has developed an expertise with design-build, modular manufacturing, and VRF (variable refrigerant flow) systems. Advanced employs more than 220 employees between Idaho and Utah and is growing every day.

Frey Lutz is based in Lancaster, Pennsylvania. Frey Lutz was founded in 1967 with the goal of providing a consistent service to the local community. Since then Frey Lutz has grown to become one of the largest plumbing, mechanical, and HVAC providers in Pennsylvania with over 150 employees. Frey Lutz focuses on commercial service, retrofit, and installation work but also supports hundreds of local residential homeowners with their HVAC and plumbing needs.

West Coast Automation Services (WCAS) is based in Tempe, Arizona. WCAS was founded in 2010 and immediately grew to become a key partner to building owners all across Arizona with their building automation and controls needs. WCAS has more than 25 team members and is growing every year due to the increasing need for energy efficient buildings and better building automation controls systems. WCAS serves commercial and industrial clients from large higher education campuses to government agencies to large health care campuses and more.

DHR Mechanical Services (DHR) is based in Kennesaw, Georgia and Tampa, Florida. DHR was founded in 1997 in Orlando, Florida and grew to West Florida and Atlanta in order to better service their grocery customer base with refrigeration services. DHR has more than 60 team members and is led by an incredible team of talented refrigeration experts and professionals. DHR also offers services in North Carolina and nearby states and will continue to grow due to the increased need for energy efficient low temperature cooling systems in retail, grocery stores, and supermarkets across the US.

Koch Mechanical is among the oldest Mechanical Contractors in the Intermountain West / Utah area. Koch has a long-term track record of customer satisfaction and reliability is second to none as a plumbing and pipefitting services partner. The Koch team has successfully been doing business from the same location for over 60 years with more than 100 different team members.

Retrofit Technology is an expert team in upgrading and retrofitting large HVAC systems including boilers, chillers, cooling towers, and other large equipment systems. Retrofit was started in 1989 and is based in Southern California but travels all over the Western US to complete projects for their customers.

Quality Heating & Air Conditioning (QH&A) is a sheet metal fabricator and service provider based in Wilmington, Delaware. QH&A was founded in 1966 and have been providing top quality sheet metal and ductwork systems across Delaware and the the Mid-Atlantic region. QH&A joined the Kelso family in 2023 with over 125 employees.