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WJO Chicago

WJO Chicago is an MZI Group company. WJO Chicago is a multi-faceted mechanical contracting company specializing in a complete array of services, including industrial-sized boiler and burner repairs and replacements, design/build retrofit projects, and centrifugal chiller repairs and replacements. Our technicians have skills and capabilities to work on equipment ranging from fan coil units, VAV boxes, rooftop units, makeup air units, and air handling units to hot water boilers, steam boilers, air cooled chillers, centrifugal chillers, and more. We offer 24/7 emergency services, standard repair calls, and preventative and premium maintenance agreements.