Government agencies in Saint Louis can trust their hvac systems to Tri State Mechanical. From initial consultation to the entire design-build process, you can count on us to manage your project from start to finish, with professionalism, efficiency and our industry’s best practices.

Our clients include, but are not limited to:

  • Local Municipalities
  • State and Federal Municipalities
  • Military Institutions
  • Secondary Schools
  • Universities


Over the years, the Tri State team has received solid endorsements from happy customers.  Job after job, we have built an excellent reputation with the installation of a comprehensive range of HVAC systems and equipment.  Our installation capabilities cover:

  • A/C controls & building automation
  • Ventilation systems
  • Cooling towers, chillers, boilers & pumps & specialty needs
  • Geo thermal and piping
  • Plumbing and ductwork
  • Clean rooms
  • Ventilation systems
  • Water source heat pumps, ductless, package units and split systems
  • Industrial lab fume exhaust system
  • Humidification & dehumidification, and more