Chicago’s Top 10 Mechanical Contractors: Leadership in experience, diversity and innovation shared by businesses with community commitments

A new boiler installation by ACSI at LaGrange Hospital

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.).

See special feature story here.

Autumn Construction Services

Autumn is a mechanical construction contractor providing mechanical HVAC systems installation and service for commercial and institutional clients and municipal agencies. Established in 1995 to provide project management and mechanical systems expertise to Chicago area owners and contractors, the company expanded its construction project management capabilities with the addition of staff professionals with backgrounds in architectural, civil and structural disciplines in 2005.

In 2009, the firm expanded its services to include mechanical contracting and systems commissioning and sustainability services. In 2013, mechanical service was added. In 2017, service offerings expanded to include industrial refrigeration sales and service, growing to a firm of 20 with as many as 40 mechanical trades as needed to support project needs.

DePue Mechanical, Inc.

With expertise that includes boiler, industrial piping, HVAC, sheet metal and services that includes energy audits, preventative maintenance, LEED consulting, retro-commissioning, and fabrication, DePue Mechanical has met the Gold Standard of Safety designated by the Mechanical Contractors of Chicago and maintains rigorous training and daily safety reminders to keep workers on the job without incident.

DualTemp Clauger

Focused on industrial refrigeration, including cold production and energy optimization and recovery and air treatment solutions including air flow control, fast cooling and cold storage, DualTemp Clauger has been serving the Chicago area since 1914 acting as a single source for industrial refrigeration design, installation, service, and supplies.

EHMS Mechanical Services

EHMS Mechanical Services traces its roots back more than 30 years to the V.A. Smith Company. The then-new company quickly became recognized for innovative mechanical design, quality installation and excellent customer service – qualities that have continued for three decades.

“EHMS repairs, replaces and maintains a lot of equipment for industries that other mechanical providers do not – boilers, chillers, ventilation systems, piping, data centers, food plants, snow melt systems and more,” the company says. “We also design and craft solutions for businesses that may know what results they need, but aren’t certain how to get there. For these businesses, we take their vision, incorporate other trades when necessary, and completely manage the implementation of a project within the allotted timeframe and budget, to achieve the desired results. Once completed, we always stand behind our work.”

F.E. Moran, Inc.

Founded in 1931 as a boiler and radiator installation service provider during the tract housing boom F. E. Moran has grown throughout the past eight decades, adding seven additional business units to complete the spectrum of life comfort and safety needs. The business units provide service and maintenance for mechanical systems, plumbing, fire protection systems, and security systems.

Helm Group & Mechanical, Inc.

With expertise is CAD/BIM, building automation, construction, engineering, fabrication modularization and facility management and service, Helm Group & Mechanical supports industries ranging from government and high rise to energy, healthcare, industrial and higher education through multiple offices.

Ideal Heating Company

Ideal Heating Company is a privately held business in Brookfield, categorized under warm air heating and air conditioning contractors. Manta shows it was established in 1917. Current estimates shows it employs a staff of approximately 25.

RMC Mechanical

Originally started in 1930 as Refrigeration and Maintenance Company by TJ Reedy, RMC Mechanical was born out of the entrepreneurial spirit, a passion for relationships, and to improve the lives of its customers and community. The company is part of the Reedy Industries family of mechanical services companies servicing Chicagoland and beyond.
Chicago are specialties include industrial and manufacturing, office buildings, chemical plants, hospitals, data centers, large retail shops, schools and nursing homes.

Southwest Town Mechanical

Also part of the Reedy Industries family, Southwest Town Mechanical has specialized in providing customers with a complete line of HVAC products and services that include service, maintenance, design/build installations, and energy management control systems for the past 50 years.


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