Morrison Construction Co. A Morrison Construction Company

A Union Mechanical Contractor Provider

Korellis Systems Control is a union mechanical contractor serving many school districts, churches and other commercial buildings in and around Chicagoland.

Commercial HVAC Services

Since 1985, we have built a first class reputation based on quick response, professionalism, and honest, hardworking, respectful service. Our customers know that we have the expertise, experience and knowledge to get them up and running with the simplest, most affordable solutions.

In 40 years of business, we have never had a school or church close because they had no heat.

More About Us

OUR MISSION

We never wanted to be the biggest name in the business: just the best. We pledge to deliver the most professional, appropriate, simple, and cost-effective solution to your control systems needs.
We urge you to compare our performance and our price with anyone else in the industry. For Korellis Systems Control every customer is important. Every service call is unique. And every problem is resolved as quickly, efficiently, and cost-effectively as possible.
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Commercial HVAC Services

  • HVAC - Commercial systems controls for schools, churches and commercial properties
  • Temperature Controls - Including Pneumatics and DDC to efficiently regulate HVAC systems
  • Kitchen Equipment - Servicing and installing food service coolers (freezers, ovens, fryers and more)
  • Rooftop Units - Capacity ranges from 3 to 150 tons with fast installation and low operating costs
  • Exchangers and Converters - Expert installation and repair from our qualified technicians
  • Process Piping - Specializing in mechanical piping fabrication and installation
Our Services

As an operations manager with nearly 4 million SF in my portfolio, I heavily depend on all my vendors to be my eyes and ears. It’s critical that they are trustworthy, responsive, and knowledgeable. Pete Korellis and the Korellis Systems team has been all of that and more. When I have an HVAC emergency, they are on the spot. Their pricing is competitive, and their work is quality every time.

In a day and age where customer service really lacks, Pete also answers his phone every time I call and has the answers I need, or gets me the answer in a timely fashion.

Pete Korellis and the Korellis Systems team are a great asset to anyone needing to add an HVAC vendor to their “go to” list.

Scott Goddard

Operations Manager, IRG Realty Advisors