HVAC Mechanic II Mid Shift

We have an opening for an HVAC Mechanic. You will perform specialized tasks in air conditioning heating or ventilation and air conditioning/refrigeration (HVAC) controls maintenance installation and repair. This position is in the Infrastructure Maintenance and Utilities Department and may be located at LLNL main site (Site 200) or at Site 300 in Tracy California.

This position requires full-time on-site presence due to the nature of the work.

You will

• Perform fabrication installation alteration troubleshooting repair operation maintenance adjustment and monitoring of a variety of air conditioning systems including large commercial and industrial chiller units and other associated HVAC/R components such as compressors motors variable air-volume air handling units ductwork control systems (pneumatic digital and electronic) and equipment safety devices.
• Perform proper and safe handling of recovery recycling and reclamation of refrigerants in accordance with
• Perform routine journey level maintenance on heat exchangers and controls for heating domestic and industrial hot water.
• Inspect low pressure boiler systems and related heating equipment Assist in piping repair and installation related to the HVAC system including drain lines.
• Repair and/or replace pneumatic control lines and valves relating to pressure reducing stations radiators heating and cooling coil control valves unit heaters boiler control and thermostatic controls.
• Provide testing adjusting and balancing services on air handling and hydronic systems in accordance with the National Environmental Balancing Bureau (NEBB) procedural standards for testing adjusting and balancing of environmental systems.
• Manage building conditions through the utilization of computerized energy/building management systems and equipment.
• Prepare standard reports including status reports permit requirements deficiency forms and preventative work requests.
• Interact with technical administrative and craft personnel of all levels.

Qualifications :

• Ability to secure and maintain a U.S. DOE Q-level security clearance which requires U.S. citizenship.
• High school diploma GED or equivalent. Completion of an apprenticeship program in air-conditioning refrigeration heating and/or ventilation trade school.
• Intermediate to advanced journey level skills knowledge abilities and extensive experience in the air-conditioning refrigeration heating and/or ventilation trade.
• Application of safety policies and procedures and possession of EPA Universal certification to work with refrigerants.
• Experience interpreting mechanical building construction drawings and manufacturers mechanical schematics to assist in maintenance alterations and installations of HVAC equipment and systems. 
• Experience and knowledge of layout and installation of HVAC equipment along with the related mechanical codes and experience using hand and power tools of the trade.
• Effective customer service and communication skills to interact effectively with clients and a multi-disciplinary team and the ability to effectively establish priorities and handle multiple tasks with changing priorities.
• Basic computer skills to complete time reporting web-based training and work orders.
• Valid California Drivers License; ability to work scheduled on-call and emergency overtime. 

Qualifications We Desire

• Working knowledge of Automated Logic Systems and direct digital control systems.
• Demonstrated experience and knowledge in low temperature refrigeration.
• Two-year HVAC technical degree or the equivalent completion of State recognized HVAC/R trade school.

Pay Range 
$50.47 - $61.34 HourlyThis position is under a Collective Bargaining Agreement and step structure. Step placement will be determined after your qualifications are fully assessed during the interview process.

Additional Information :

#LI-Onsite

Position Information

This is a Career Indefinite position open to Lab employees and external candidates.

Why Lawrence Livermore National Laboratory

• Included in 2026 Best Places to Work by Glassdoor!
• Flexible Benefits Package
• 401(k)
• Relocation Assistance
• Education Reimbursement Program
• Flexible schedules (*depending on project needs)
• Our values - visit  300

  Site 300 is an experimental test site operated by LLNL.  Situated on 7000 acres in rural foothills approximately six miles southwest of downtown Tracy and 15 miles southeast of Livermore Site 300 hosts approximately 200 employees with expertise in such fields as engineering chemistry biology and environmental restoration. Employees assigned to work at Site 300 may be exposed to the organism that causes San Joaquin Valley Fever (coccidioidomycosis).

  Security Clearance

  This position requires a Department of Energy (DOE) Q-level clearance.  If you are selected we will initiate a Federal background investigation to determine if you meet eligibility requirements for access to classified information or matter. Also all L or Q cleared employees are subject to random drug testing.  Q-level clearance requires U.S. citizenship. 

  Davis Bacon Act

  The Laboratory performs a variety of work including some that may fall under Davis Bacon Act requirements.  When work scope falls under this Act the Laboratory complies with the prevailing wage requirements.

  Pre-Employment Drug Test

  External applicant(s) selected for this position must pass a post-offer pre-employment drug test. This includes testing for use of marijuana as Federal Law applies to us as a Federal Contractor.

  Wireless and Medical Devices

  Per the Department of Energy (DOE) Lawrence Livermore National Laboratory must meet certain restrictions with the use and/or possession of mobile devices in Limited Areas. Depending on your job duties you may be required to work in a Limited Area where you are not permitted to have a personal and/or laboratory mobile device in your possession.  This includes but not limited to cell phones tablets fitness devices wireless headphones and other Bluetooth/wireless enabled devices.  

  If you use a medical device which pairs with a mobile device you must still follow the rules concerning the mobile device in individual sections within Limited Areas.  Sensitive Compartmented Information Facilities require separate approval. Hearing aids without wireless capabilities or wireless that has been disabled are allowed in Limited Areas Secure Space and Transit/Buffer Space within buildings.

  Pre-Placement Medical Exam

  A job related pre-placement medical examination may be required.

  How to identify fake job advertisements

  Please be aware of recruitment scams where people or entities are misusing the name of Lawrence Livermore National Laboratory (LLNL) to post fake job advertisements. LLNL never extends an offer without a personal interview and will never charge a fee for joining our company. All current job openings are displayed on the Career Page under Find Your Job of our website. If you have encountered a job posting or have been approached with a job offer that you suspect may be fraudulent we strongly recommend you do not respond.

  To learn more about recruitment scams:  Employment Opportunity

  We are an equal opportunity employer that is committed to providing all with a work environment free of discrimination and harassment. All qualified applicants will receive consideration for employment without regard to race color religion marital status national origin ancestry sex sexual orientation gender identity disability medical condition pregnancy protected veteran status age citizenship or any other characteristic protected by applicable laws.

  Reasonable Accommodation

  Our goal is to create an accessible and inclusive experience for all candidates applying and interviewing at the Laboratory.  If you need a reasonable accommodation during the application or the recruiting process please use our online form to submit a request. 

  California Privacy Notice

  The California Consumer Privacy Act (CCPA) grants privacy rights to all California residents. The law also entitles job applicants employees and non-employee workers to be notified of what personal information LLNL collects and for what purpose. The Employee Privacy Notice can be accessed here.

  
  

  Remote Work :

  No

  
  

  Employment Type :

  Full-time