The Early Years

At the height of the Great Depression, Cletus Merz exercised his entrepreneurial spirit and founded Merz Sheet Metal in 1935. Even with its modest beginning on the north side of the Effingham County courthouse, the business flourished. A mere two years later, Cletus moved his shop to a newly constructed site on South First Street.

Unprecedented Growth

After World War II, during the great building boom of the 50’s, Merz enjoyed unprecedented growth. By 1968, Merz Sheet Metal had become affiliated with the International Brotherhood of Sheet Metal Workers. This strong relationship continues to this day.

Relocation and Expansion

In 1970, Henry Merz joined his father in the business and in 1975 made the decision to relocate to their current facilities and at that time expanded to include a full service residential heating and cooling division. A few years later, Merz also initiated significant efforts with commercial HVAC operations.

Present Day

Today, Merz is owned by Pat Gebben and is recognized as one of the largest, most modern residential and commercial HVAC companies in the state of Illinois.

The Merz mission is to provide their customers with the total indoor comfort by supplying the very best central air installations, service, and maintenance. But above all, Merz works to earn your trust. Because nothing is better than dealing with someone you trust. And nothing is worse than dealing with someone you don’t. It takes years to build trust and only a moment to destroy it. That’s why Merz Heating and Air Conditioning stands by their word and they stand behind their work.


  • We appreciated the fast and friendly service that your company provided, the guys were very friendly and patiently answered any questions we had, they also did a great job cleaning up.  My husband and I will be calling your company from now on and will recommend your company highly.  Thank You  

    Chuck & Jean - Watson, IL.

  • "I want to compliment you for your staff at Merz. The young lady who answered the phone after 8PM could tell I was a desperate housewife –NO AIR CONDITIONING. The young man who made the service call certainly deserves a pat on the back. He was so courteous and efficient. Thank you!"

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    – Carolyn (Effingham)

  • "Thank you for the prompt service I received on my furnace. It was very frustrating to hear it wasn’t working and me down in Florida. Again, Thank You."

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    – Juanita (Effingham)

  • "Thank you for the work done. The two gentlemen that came to do the work were pleasant & nice to deal with when each were here to do their part of the job required."

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    – Raymond (Effingham)

  • "Thanks again for all of your help. We really appreciate the professionalism of your guys and how nice they were while they were out here working."

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    – Jason (Charleston)

  • "Just wanted to thank you and the crew that installed my new AC & furnace, their expertise and skills are much appreciated! The personal touch in keeping my house clean was nice also."

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    – Karen (Robinson)

  • "Thanks so much for your prompt and courteous service. I really appreciated you getting my system in and operational in one day. I am Cool! Also enjoyed the service guys, very helpful. With sincere appreciation- "

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    – Cheryl (Vandalia)

  • "Thank You Merz Heating & Air Conditioning for an awesome job installing our new furnace! Great installation & customer service! If you have heating & air needs give Daryl Smith a call, he's the man!!"

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    – Jenna (Effingham)