Sr. Commercial HVAC Service Technician

Together We Build – Partnership, Innovation, Excellence, and Safety

Four Star Mechanical is part of Kelso Industries, with 3,500+ employees across 29 operating companies, delivers top HVAC, mechanical, plumbing, refrigeration, and electrical solutions nationwide. Join us to grow your career, make an impact, and be part of a high-performing team. Learn more about us at

Recruiter Notice:
We respectfully ask external recruiters and staffing agencies not to submit candidates. We only accept direct applications.

We're hiring an experienced HVAC Service Technician to install, inspect, repair, and maintain heating, ventilation, air conditioning, and refrigeration systems in commercial settings.

• 8-hour shifts, Monday–Friday
• Overtime and rotating on-call availability (7-day rotations)

• Install, maintain, and repair HVAC and refrigeration systems, including boilers, chillers, fans, pumps, valves, thermostats, and motors
• Perform routine inspections and preventive maintenance
• Diagnose and fix mechanical and electrical issues
• Work with copper tubing and piping, including cutting, threading, testing, and insulating
• Use hand tools, power tools, and test equipment safely
• Ensure compliance with safety practices and building codes
• Read and follow blueprints, diagrams, and work orders
• Provide excellent customer service and complete billing paperwork
• Support emergency repairs while on-call
• Perform other duties as assigned

• 5+ years of commercial HVAC, plumbing, or refrigeration experience
• HVAC and brazing license required
• Journeyman HVAC license preferred
• Universal Refrigerant License required
• Hydronic or plumbing licenses a plus
• Valid driver's license and clean driving record
• Able to be on a rotating on-call schedule
• Must be able to access and work on active construction sites

• Basic knowledge of direct digital controls (DDC) and network systems (TCP/IP, RS-485)

• Work may be done in an office or on job sites
• Fieldwork includes exposure to outdoor weather, heights, mechanical parts, and loud noise
• Must be physically present at job sites as needed
• Flexibility with hours may be required

• Standing and walking for extended periods
• Lifting up to 50 lbs or more
• Bending, kneeling, crouching, and reaching regularly
• Occasional desk/computer work
  
  Must be able to navigate all areas of job sites

We're committed to attracting talented individuals who seek a company with a strong foundation of success and an outstanding culture. We proactively provide competitive compensation, comprehensive benefits, and clear pathways for career advancement with autonomy and flexibility in an entrepreneurial environment.

Learn more about us at

We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate in any aspect of employment on the basis of race, color, religion, national origin, ancestry, gender, sexual orientation, gender identity and/or expression, age, veteran status, disability, or any other characteristic protected by federal, state, or local employment discrimination laws where Kelso does business.