Since 1976, Johnson-Melloh has been providing affordable energy efficient HVAC solutions for our clients. At Johnson-Melloh we design, build, install, operate and maintain commercial HVAC and building automation control systems that provide efficient, sustainable, healthy and productive work environments. Many of our customers look to Johnson-Melloh to provide economical solutions to their cooling and heating needs whether it be servicing systems or installing new ones.

Chiller Team Leader, Frank Hren

ChillerTeam Leader, Frank Hren has been working on chillers since 1975. He started his career with Trane Co. rebuilding compressors and quickly moved into the field troubleshooting, overhauling and providing factory direct service startups. He became the field service manager responsible for over 20 factory direct service technicians. After 22 years with Trane he followed an opportunity to become the service manager for the local and eventually McQuay (Now Daikin) Factory Service Agency. After 17 year in this capacity Frank Joined Johnson-Melloh to lead our chiller team and share his 40 years of knowledge of servicing and repairing chillers.

Chiller Team Sales Engineer, Jim Williams

Jim Williams is a graduate of Trane’s 1989 graduate engineering sales program where he learned the application and operation of chillers. After a 5-year tenure in Tulsa, he moved to Indianapolis and took a position as a building automation project engineer and an existing building sales engineer where he designed, installed, and programmed chiller plants and chiller plant controls. Jim came to Johnson-Melloh in 2013 to provide engineering and technical expertise to the Johnson-Melloh service department.

Our chiller service division is poised to solve many of your chiller plant needs including:

Chiller Types:

  • Water and Air Cooled Centrifugal
  • Water and Air Cooled Screw
  • Absorption Chillers
  • Water and Air Cooled Scroll
  • Water and Air Cooled Reciprocating


  • Comfort Cooling
  • Industrial Process
  • Ice Storage
  • Heat Recovery

Chiller Services

  • Minor Repairs
  • Major Repairs
  • Overhauls
  • Compressor Enhancements Renewals
  • Control Panel Retrofits
  • Eddy Current Testing
  • Tube Brushing
  • Tube Replacement
  • Condenser Coil Cleaning
  • Service Agreements