Service HVAC TechnicianResponsibilitiesQualifications

4-L Engineering Jobs

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Richardson, TX Until 8/21/2026 2+ years exp First posted March 18, 2026 Last posted March 18, 2026
Job description

About 4-L Engineering Co. Inc.

4-L Engineering Co. is a long-standing leader in air conditioning, plumbing, and mechanical systems, serving the Dallas-Fort Worth Metroplex for over 60 years. We specialize in providing innovative solutions for complex problems across multi-family, commercial, and industrial facilities, always approaching projects from a comprehensive building envelope perspective.


Our mission is to deliver exceptional service, quality equipment, and professional technicians with the highest level of training and support in the industry. We are dedicated to transforming our industry, community, and the world through a relentless commitment to identifying root causes and providing innovative solutions.

We're searching for a dedicated and experienced Service HVAC Technician to join our team! If you have a strong background in HVAC systems and a commitment to excellent service, we encourage you to apply.

Responsibilities

  • Troubleshooting, diagnosing, and repairing a wide range of commercial HVAC systems, including rooftop units (2-100+ tons).
  • Working with various control systems, including Pneumatics, DDC, and VAV systems.
  • Servicing Variable Frequency Drives.
  • Maintaining clear and consistent communication with dispatch, your manager, and our parts and installation teams.
  • Participating in our on-call rotation to provide timely service to clients.
  • Completing all necessary paperwork accurately and efficiently.
  • Keeping your company vehicle clean, organized, and adequately stocked with inventory.
  • Upholding a clean and professional appearance at all times.
  • Actively participating in ongoing training and development opportunities.

Qualifications

  • 2+ years of HVAC service experience preferred.
  • Proven expertise in troubleshooting and repairing HVAC system controls and rooftop systems (2-100+ tons).
  • Strong knowledge of Pneumatics, DDC, VAV systems, and Variable Frequency Drives.
  • Knowledge of reciprocating chillers, screw chillers and boilers is a significant plus.
  • Excellent communication skills, with the ability to effectively share knowledge with team members and interact professionally with clients.
  • Highly self-motivated and capable of working independently.
  • Possess a positive attitude, professional demeanor, strong work ethic, and keen attention to detail.
  • Basic computer proficiency.
  • Hold proper certifications, including EPA certification.
  • Must have and maintain a clean driving record.
  • Ability to pass a comprehensive background check.
About this role

Summary

Troubleshoot, diagnose, repair HVAC systems, controls, and participate in ongoing training.

Job title

Service HVAC Technician

Experience level

2+ years

Minimum experience

2+ years exp

Industry

mechanical systems

Location requirements

Richardson, TX; on-site work required

Salary

Not specified

Management role

No

Skills & keywords

Required skills

HVAC servicetroubleshootingcontrolsrooftop unitsVAV systemsVariable Frequency DrivesEPA certificationclean driving record

Preferred skills

reciprocating chillersscrew chillersboilers

Specializations

HVAC systemscontrolsrooftop unitsVAV systemsVariable Frequency Drives
Locations

Structured locations inferred from the posting.

Richardson, TX, USA

On-site City