Commercial Mechanical Services is one of the oldest and most well respected Commercial/Industrial HVAC/Refrigerationn contractors in the Rockford area. We specialize in all areas including: heating, ventilation, air conditioning, refrigeration, sheet metal, piping, medical gas, design & build, rooftops, reciprocating chillers, boilers, refrigerant conversions, pneumatic & DDC controls, energy managment, computer room air conditioning, and more. All of our customers' HVAC/Refrigeration needs are being met by one of our expert certified technicians 24 hours a day, 7 days a week, 365 days a year. Commercial Mechanical Services has been proudly serving Northern Illinois and Southern Wisconsin since 1953.