Wiegmann Associates has been named as one of St. Charles County’s largest businesses by the St. Louis Business Journal. With revenue of 61 Million in 2020, Wiegmann ranks 9th in the 25 largest businesses in St. Charles County.

Weigmann has been headquartered in St. Charles since 2002 and employs more than 110 engineers, project managers, building automation specialists, HVAC service technicians and administrative staff.

Wiegmann is ranked among the top 50 specialty contractors in the Midwest by Engineering News-Record and St. Louis’ fifth-largest mechanical contractor by the St. Louis Business Journal.

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.