Mechanical Engineering & Construction

About Us


We are
ACI Mechanical

We are a complete service merit shop design-build, commercial/industrial mechanical contractor. Our company was started back in1945 with a solid commitment to customer service that still exists today. The ACI team of engineers, project managers, skilled welders, pipe fitters, sheet metal mechanics, service techs, and support staff are here to serve you, our client.

Mechanical Contractors & Engineers

Industry Access

We use the latest version of Design software and model all projects before construction begins.

Mechanical Contractors & Engineers

Planning Strategy

We operate both an in-a-house sheet metal fabrication facility and pipe fabrication facility as well.

Mechanical Contractors & Engineers

Client Satisfaction

Our Team has met the owner’s construction schedule, exceeded their safety expectations.

Mechanical Contractors & Engineers

On time Delivery

Our piping fabrication facility uses the Panajaris Automated Orbital Welding System.


Our philosophy is to create an accident-free environment through leadership, communication,
employee involvement, and recognition. By fostering an attitude of safety consciousness, our key
leaders develop a “spirit” of zero harm and reduce incidents as a result.

It is a fact. Rules do not prevent accidents, people do.

For two consecutive years, we received Accident-Free Award.

Our History

Our company was founded in 1945 in Marshalltown, Iowa as a local appliance repair shop and operated under that structure until 1957 when we became the local dealer for Lennox Industries. Now almost 60 years later, we continue our relationship with Lennox Industries as an Alliance dealer.

We operated as a local heating and cooling company unitl the early 80’s when we added a traveling element to our business, working mainly in the government markets completing military family housing projects and then Corps of Engineers projects across the continutal United States.  During this timeframe we added plumbing to our mix of business offerings and by the mid 80’s we had become a full service mechanical contractor focused on the heavy commerical and industrial market place. 

In August of 1998 we became part of the Comfort Systems USA family of companies with the goal of expanding our footprint in the national markets and reastablishing ourselves in the local HVAC service market.  Today we operate as two companies, ACI Mechanical, Inc. which is focused on larger heavy commerical and industrial construction projects and Comfort Systems USA Midwest, which is focused on HVAC service, building automation, and small mechanical construction projects.  We may be two companies, but we operate as one to meet the expanding needs of our clients.

from concept

to reality

Always Ready

Our Mission

A diversified mechanical contracting, engineering and management firm with professional, skilled and experienced personnel, capable of providing a variety of quality services to public and private customers who desire to work with a flexible contractor that offers complete “tunr-key” construction services on going support throughout the United States.

ACI Engineers at work

Want to join our Team?

Our Locations

ACI Mechanical Engineering & Construction Headquarters
Merit Shop ACI Mechanical Engineering & Construction
Mechanical Contractors & Engineers

Let Us Know your suggestions

We Hear you

Join our Team
of Experienced Professionals

Mechanical Engineering & Construction
Mechanical Engineering & Construction