ST. LOUIS, MO – Wiegmann Associates, one of the largest mechanical contractors in the St. Louis region, has doubled the size of their commercial HVAC service division through the acquisition of SystemAire’s service assets. Seventeen team members, including a dispatcher and service technicians, have joined the Wiegmann team. Wiegmann also acquired service trucks and equipment, positioning the company as one of the largest commercial HVAC service providers in the St. Louis region with 27 total technicians.

“As we grow our service division, we remain committed to providing the best solutions for our clients, backed by our engineering and energy management departments,” said Chad Wiegmann, president of Wiegmann Associates. “Our 27 HVAC service technicians are supported by our team that includes 15 engineers and a dedicated and experienced energy management division. This allows us to handle all of our clients’ commercial HVAC needs – complex or simple – and also to look beyond the immediate service or repair to uncover long term savings and the best energy-efficient solutions for their buildings.”

“When we knew it was time to transition out of this business, we were committed to securing an HVAC partner that would provide our same level of excellent service,” said Kelsie Sams, president of SystemAir, Inc. “The leadership of Wiegmann and SystemAire have enjoyed a multi-decade relationship. Our clients will benefit from Wiegmann’s expertise, strength and stability.”

The Wiegmann Service Department provides commercial HVAC service contracts, preventative maintenance and 24-hour emergency service, with real-time dispatch tracking to ensure efficient, responsive service and accurate billing.

Former clients of SystemAire will receive HVAC service by the same experienced technicians who worked on their equipment, with support from Wiegmann service and engineering staff. Wiegmann did not acquire any SystemAire construction projects. Those projects will be completed by SystemAire.


Wiegmann Associates is a St. Louis-based mechanical contractor and a national leader in design/build HVAC projects.  Since 1995, Wiegmann Associates has engineered and installed innovative, energy saving and cost-efficient HVAC solutions, refrigeration systems and automation controls for clients in a wide range of industries, including senior living, food and beverage distribution, warehouse, healthcare, commercial and industrial. Wiegmann also provides 24-hour preventative maintenance programs and service in the St. Louis region. Wiegmann is ranked among the top 50 specialty contractors in the Midwest by Engineering News Record and the top 10 largest mechanical contractors by the St. Louis Business Journal. For more information, visit or call (636) 940-1056.

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