(No one can work on your boilers when they are running).

Save money by getting any repair work to your boilers done now, during the “Off Season.”

Just work us into YOUR normal schedule……And not wait for a late night or week-end emergency!

Enjoy your summer to the fullest extent, by knowing that a little P.M. (Preventive Maintenance)
now, will save you problems and headaches in the future.

Let’s catch up with our projects and stop problems from happening, before they start.

  • Pipe leaks/repairs
  • Burner PM Service
  • Free Refractory Inspections


Call us today to schedule your appointment at (773) 737-9200
Frank Lacny
Frank founded American Combustion Service, Inc. & ACSI Mechanical in 1984. His consulting and specialized service capabilities for working on any type of fuel burner and/or fuel has earned ACSI a reputation as “burner specialists” in the community. Frank has trained and consulted for many groups and companies in Chicago and the Chicago Metropolitan Area. His areas of expertise include burner start-up work, unusual boiler room problem-solving situations, and general backup service support.


  • ACSI Receives an Award from the Village of Mokena!

    American Combustion Service Inc. is thrilled to receive the 2019 Beautification Award from the Village of Mokena. We take pride in everything we do, we are grateful to be recognized for it!...

  • How do You Benefit by Using Our Services?

    By relying on our 24 hour team of qualified and experienced personnel, to give you help when you need it most....


    Kids are back in school, trees are starting to turn colors, and the cold weather is right around the corner. Now's the time to get your boilers/burners tuned up.  Most tune-ups save enough money to pay for themselves, if not more! ...