General information Insulation Midwest, Inc. is a mechanical insulation union company. IMI Specializes in all aspects of commercial & industrial insulation: Heating & Cooling, Domestic Water, Refrigeration, Chilled Water, Ventilation, Steam, Duct Work, GLYCO, Food Processing, Boiler, Ammonia, Grease Duct, Rain Water, and Exhaust Duct Insulation.