HVAC Technician III

Reliant Critical Infrastructure; Ashburn (VA); On-site; USD 78,000 - 110,000; Full time

Job summary

Reliant Critical Infrastructure in Ashburn, VA, is seeking an HVAC Technician III to lead and perform maintenance on mission-critical mechanical systems in data centers. You will install, service, and operate complex equipment, and guide a team of technicians to ensure uptime and adherence to contract requirements.

The role combines hands-on troubleshooting with technical leadership, requiring on-call availability, strong client communication, and commitment to safety, quality, and documentation.

Qualifications

• High school diploma or GED plus basic AC theory training.
• 7+ years of large commercial HVAC service experience; 8+ preferred.
• Ability to diagnose, troubleshoot, and repair HVAC equipment.
• Experience with DDC, pneumatic controls, and VFDs.
• Ability to train and guide other technicians.
• Proficiency in Microsoft Office or related software.
• EPA Universal Certification and Virginia Journeyman HVAC license preferred.
• U.S. citizenship and ability to obtain security clearance preferred.

Responsibilities

• Perform preventive maintenance, diagnose problems, and complete repairs on commercial HVAC equipment.
• Service air- and water-cooled chillers, cooling towers, boilers, unit heaters, and related HVAC components.
• Maintain HVAC air distribution systems, including AHUs, FCUs, fans, and pumps.
• Troubleshoot DDC, pneumatic controls, and VFDs as part of operations.
• Maintain and back up building automation software as required.
• Lead, supervise, and train less-experienced technicians.
• Monitor mechanical services for compliance with contractual commitments.
• Participate in on-call assignments and maintain reliable attendance.

Skills

Technical leadership

Troubleshooting

Mentoring others

HVAC systems knowledge

On-call availability

Education

High school diploma or GED

EPA Universal Certification

Virginia Journeyman HVAC license

OSHA certification

Tools

DDC

Pneumatic controls

VFDs

Job description

As an HVAC Technician III, you will serve as the lead technician for mission-critical mechanical services and maintenance under contract, supporting data center mechanical equipment. This role combines hands-on troubleshooting and repair with technical leadership, mentoring other technicians, and monitoring compliance with contractual commitments. You will provide expertise in equipment installation, service, maintenance, and operation.

Responsibilities

• Independently perform preventive maintenance, diagnose problems, and complete routine and emergency repairs on commercial HVAC equipment.
• Service air- and water-cooled reciprocating chillers, centrifugal and screw package chillers, cooling towers, natural gas boilers, unit heaters, and electric duct heaters.
• Maintain HVAC air distribution systems, including air handling units, fan coil units, fans, and associated equipment, as well as HVAC water pumps.
• Troubleshoot and service pneumatic controls, direct digital controls (DDC), and variable frequency drives (VFDs).
• Maintain, upgrade, and back up building automation software as required.
• Lead, supervise, and train less-experienced technicians while continuing to develop technical knowledge.
• Monitor mechanical services and maintenance for compliance with contractual commitments.
• Participate in on-call assignments, maintain regular and reliable attendance, and perform other duties assigned by the supervisor.

Qualifications

• High school diploma or GED and successful completion of a basic air conditioning theory course.
• At least 7 years of large commercial HVAC service experience; 8 years preferred.
• Ability to independently maintain, troubleshoot, and repair HVAC equipment using appropriate diagnostic tools and instruments.
• Experience with DDC, pneumatic controls, and variable frequency drives.
• Ability to provide technical guidance and train other technicians.
• Proficiency in Microsoft Office or related software.
• OSHA certification.
• Valid Virginia or Maryland driver’s license.
• Completion of required client training.
• EPA Universal Certification and a Virginia Journeyman HVAC license are preferred.
• U.S. citizenship and ability to obtain a security clearance are preferred.