is not all we do. We're a full service


With 30+ years of experience, Tri-State Mechanical Services is known for providing exceptional reliability in HVAC, Piping, Ventilation, Refrigeration, and Steel Fabrication, to just name a few. Our commitment to quality has been recognized by our many patrons in the St. Louis area. We serve educational facilities, multi-story appartments/hotels, office/residential, commercial and industrial clients. Let us make your next project a success.


We are dedicated to maintaining exceptional reliability for all your HVAC needs

To Protect Our Customers & Staff During Covid Epidemic All Our Staff are Equiped With Full Personal Protective Gear.



A Mechanical Contracting Service You Can Count On 24/7

Since 1989 we have proudly served the St. Louis and Metro areas including Central Missouri and Southern Illinois. We provide the highest quality of workmanship everyday as we continue to build long term relationships with our clients.

For Dependable Service, Quality Installation and 1st rate Solutions in Commercial & Industrial Mechanical Services, HVAC, Refrigeration and Kitchen equipment, give us a call today.  We sell, install and maintain everything from industrial rooftop units to walk-in freezers, residential furnaces, boilers, and Ac systems.

We have 24 Hour Emergency Service available with an extensive parts stock for all Commercial and Residential equipment, old and new. If we don’t have it we’ll source it fast. Look no further for a quality Mechanical Contractor in St. Louis.

Specializing in HVAC & Food Service Equipment


Commercial Refrigeration

Installation, Sales, Repair, & Service

  • Professional team of technicians
  • Honest, Dependable Service 24/7
  • Servicing all brands including

We service york lennow carrier rheem ruud trane

Barbara Larson Godiva Chocolatier, Inc
Our Soft Serve machine was installed in a very timely and professional manner. The specialist that installed the machine, Greg Bruyere was fantastic! He was informative and extremely helpful in training myself and the associates. He even... Read More >

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Bridget at Pattonville Highschool
The installation of our new freezer/cooler was smooth and trouble free.  We are happy with the finished product and were well informed through the installation process of any changes in the time line due to unexpected conditions.  The crew was efficient, polite, and did not interfere with our daily processes.  We were very pleased with the process from start to finish.

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Stanley’s Cigar Lounge
Thanks again Greg for all your hard work and thoughtful analyzation of our HVAC needs for the humidor at Stanleys Cigar Lounge. Your calculations for the load with all the humidity we are pumping into the room was dead on and it’s working like a champ. Again, thanks, we will be in touch if we need anything else. Best Regard