Customer solutions delivered

Clients come to ACSI for solutions for their piping, all types of boilers, equipment installations, emergency pipe repairs and combustion systems needs. Our experience and large parts inventory make it easy to mobilize and help you resolve unexpected downtime or leaks. We supply in-house maintenance staff trained to keep your systems running smoothly and, we provide 24-hour emergency piping and mechanical repairs.

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Our Approach Sets Us Apart

Customers that come to us stay with us - find out why

What would you do with 6% savings in fuel costs?


See our Latest Success

ACSI recently installed a new boiler, a high-efficiency burner, an economizer and related energy saving equipment to help a local hospital save energy costs. A boiler is only as efficient as the burner it is mated to, and ACSI installed one of the most efficient burners available. At most, the old burner was 76 to 78 percent efficient. The new burner will offer increased commodity saving of 80 to 85 percent! To capture further savings, the client also elected to install an economizer too. Since the facility couldn't shut down for work to be completed, the utilities remained operational while the older unit was safely disconnected and removed.

// What Our Clients Say




ACSI Mechanical Group Now Provides ASME Authorized Boiler & Pressure Vessel Repairs

At ACSI Mechanical Group, we pride ourselves in providing specialized maintenance and installation services to help you reduce risks, lower costs, and maintain your facilities. In addition to Service, Mechanical, Refractory, and Piping Services, we now offer a full suite of boiler services, with the addition of American Boiler & Tank Repair.  During Boiler Normal … Continue reading “ACSI Mechanical Group Now Provides ASME Authorized Boiler & Pressure Vessel Repairs”

ACSI Mechanical Group Wins MCA of Chicago Safety Award Two Years in a Row

ACSI Mechanical Group was recently awarded the 2019 and 2020 Safety Award in the category of 50,000 hours or less by the Mechanical Contractors Association of Chicago (MCA). As we value our workers’ safety first and foremost, such an award is a great honor for ACSI. See the full list of winners here.

ACSI Mechanical Group Celebrates Our Employees!

American Combustion Service, Inc. had 3 employees nominated for the Everyday Hero Award. They have been spotlighted on Mechanical Service Contractors of America website.

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19325 S. Schoolhouse Road, Mokena, Illinois 60448 (773) 737 - 9200

24 Hours Emergency Services :
(773) 737 - 9200