ACSI Article


This listing of the top 10 in the mechanical contractors industry reflects an amalgam of experience, relationships, and perceptions. While this isn’t a scientific group – there are many other companies worthy of recognition – it provides a clue about some of the diversity, initiative and community focus. This list includes forward-thinking businesses which have embraced community engagement, high standards of service and delivery, and innovation to support the construction industry.

The listing is alphabetical and should not be considered a ranking. Information presented here is taken from the companies’ websites, and in some cases, additional research and responses to our surveys.


American Combustion Service, Inc. (ACSI)

This company specializes in installing and servicing all types of fuel burning equipment. Its experience includes burning alternate fuels, such as light and heavy oils, sawdust, digester gas, landfill gas, coal and oxygen enriched pulverized coal. ACSI’s core value focus is: “Client-centered customer service while exceeding expectations.”

ACSI’s three divisions include: Piping and mechanical installations (ACSI Mechanical), refractory repairs and installations (American Refractories) and 24-hour service (American Combustion Service, Inc.).

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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.