With 222 employees nationwide, Wiegmann Associates has been named one of St. Louis’ Largest Mechanical Contractors by the St. Louis Business Journal. Wiegmann is also ranked 56th among the top specialty contractors in the Midwest region by Engineering News Record.

Wiegmann Associates is a St. Louis-based mechanical contractor serving the commercial, industrial and institutional markets, 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 and automation controls for clients in a wide range of industries. Wiegmann also provides 24-hour preventative maintenance programs and service in the St. Louis region.