Commercial Mechanical Inc. is a full service mechanical contracting firm with over 45 years of successfully installing mechanical / HVAC / process piping and plumbing systems. Exceptional knowledge in Heating/Cooling, Water/Wastewater, Geothermal, Refrigeration, Industrial Process, Lab/Medical Gas and Plumbing systems. CMI employs skilled union plumbers and pipe fitters who provide the highest level of skill and safety. Our enthusiastic and experienced office staff is dedicated to the success of our clients. CMI primarily bids plan and spec projects throughout the state of Illinois.