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Posted August 27, 2026

HVAC-R Service Tech

CoolSys
Saint Charles, Missouri 63301, United States Full-Time
71500.00 - 96000.00
Reference: 3162389782

CoolSys, a leader in sustainable, energy-efficient HVACR solutions, is seeking an HVAC/R Service Technician to join our HVAC Wholesale team. In this role, you will install, troubleshoot, repair, and maintain commercial and industrial HVAC/R systems, ensuring optimal performance and energy savings for clients across North America. You will diagnose system issues, perform preventive maintenance, and provide exceptional customer service on-site. At CoolSys, you'll work with innovative technology in a collaborative, inclusive culture that supports your growth, values diversity, and promotes safety, performance excellence, and work-life balance.

Responsibilities

  • Travel to customer sites to diagnose, repair, and maintain commercial and industrial HVAC/R systems, ensuring reliable operation and energy efficiency.
  • Perform routine and preventive maintenance on rooftop units, split systems, rack systems, refrigeration cases, and related HVAC/R equipment.
  • Troubleshoot mechanical, electrical, and refrigeration issues using diagnostic tools, schematics, and technical documentation to identify root causes.
  • Install, start up, and commission HVAC/R components and systems in accordance with Cool
  • Sys standards, manufacturer specifications, and local codes.
  • Handle refrigerants in compliance with EPA regulations, including recovery, evacuation, leak detection, repair, and accurate system charging.
  • Document all service activities, findings, recommendations, and parts used in digital work order systems with clear, accurate, and timely reporting.
  • Communicate professionally with customers, explaining issues, repair options, and best practices to improve system performance and energy savings.
  • Collaborate with the Technical & Maintenance team to resolve complex issues, share knowledge, and support continuous improvement of service processes.
  • Follow all Cool
  • Sys safety policies and OSHA requirements, maintaining a clean, organized work area and service vehicle.
  • Support training and mentoring of junior technicians by sharing expertise, demonstrating best practices, and promoting a culture of learning and performance excellence.

Required Skills

  • Commercial HVAC/R diagnosis and repair
  • Preventive and predictive maintenance
  • Installation and startup of HVAC/R systems
  • Reading blueprints, wiring diagrams, and schematics
  • Refrigeration cycle analysis and superheat/subcooling calculations
  • Brazing, soldering, and basic piping skills
  • Refrigerant recovery, evacuation, and charging
  • Use of digital gauges, combustion analyzers, and diagnostic tools
  • Electrical troubleshooting (low and line voltage)
  • VFDs, controls, and BMS interface basics
  • Safety procedures and OSHA compliance
  • Customer service and client communication
  • Time management and job documentation
  • Use of mobile work order and CMMS systems
  • Driving and operating a service vehicle

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