Wiegmann Associates is one of the HVAC industry’s premiere national design/build mechanical contractors. From HVAC design to systems installation and service, Wiegmann has focused on innovative, energy saving and cost-effective HVAC solutions since 1995. Based in St. Louis, MO we've built projects in 42 states and counting, ranging up to $35M. From beer distribution facilities to specialized health care centers and multi-family housing, our experience spans a broad range of industries. Our highly skilled St. Louis HVAC service team is professional, responds quickly, and is available 24/7 for emergencies in St. Louis.