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Journeyman

Daikin Applied · Elmhurst, IL · Full time

Posted Jul 31, 2026 · We last checked this listing on Oct 6, 2026

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Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about a repair where you found the first part you replaced was not the real cause. What did you learn?

What they are checking: Honesty and a habit of confirming the root cause before replacing parts.

How do you explain a costly repair to a building owner who is not technical?

What they are checking: Whether they communicate clearly and honestly so the customer trusts the recommendation.

What would you do

You are at a customer's building and they ask for work not on the ticket. What do you do?

What they are checking: Whether they serve the customer while keeping the scope and billing clear with the office.

You are covering Elmhurst, Moline or Peoria territory alone. How do you manage your day when two urgent calls come in?

What they are checking: Judgment and communication when working independently across a large area.

About the work

Walk me through how you diagnose a rooftop unit that is running but not cooling.

What they are checking: Their independent diagnostic process, which the posting calls intermediate to advanced.

How do you prepare and braze a copper line set so the joint does not leak?

What they are checking: Hands-on brazing skill, including nitrogen purging to prevent internal scale.

A chiller trips on high head pressure. What are the most likely causes, and how do you narrow them down?

What they are checking: Understanding of refrigeration cycle problems on commercial equipment.

How do you trace a wiring fault in a control circuit when the schematic is missing or wrong?

What they are checking: Electrical troubleshooting skill that does not rely on perfect documentation.

How do you handle refrigerant recovery and recordkeeping on a commercial job?

What they are checking: Knowledge of EPA 608 rules and responsible handling of refrigerants.

What pipefitting work have you done on hydronic systems, and what do you check before you fill a system?

What they are checking: Pipefitting experience mentioned in the posting and care around pressure testing.

How do you keep yourself safe when working on energized equipment or on a roof?

What they are checking: Commitment to lockout/tagout, fall protection and other safe work practices.

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The full job description

As published by Daikin Applied.

About Thermosystems: Founded in 2000, Thermosystems, a member of the Daikin group, is a manufacturer’s representative specializing in commercial heating, ventilation, and air conditioning (HVAC) products and controls. Our mission is to be the trusted partner behind complete HVAC solutions, bringing the expertise and guidance our customers deserve—because better buildings start with better partners. Headquartered in Elmhurst, Illinois, we operate offices in Elmhurst, Romeoville, Peoria, Chicago, the Quad Cities, and Des Moines. Our organization includes dedicated equipment, solutions, and service sales teams, along with a comprehensive parts and full-service department to support the products we represent. We offer a comprehensive benefits package that includes medical, dental, and vision insurance; short-term disability and life insurance; paid time off and paid holidays; and a 401(k) with profit sharing, among other benefits. At Thermosystems, you will be encouraged to grow, apply what you know, and see the impact of your hard work. If you want to learn more about Thermosystems, visit us at www.thermohvac.com today! The HVAC Technician will perform maintenance of HVAC equipment to include repair and replacement of defective equipment, components, or wiring. This role will require intermediate to advanced independent diagnostics, troubleshooting, pipefitting, and brazing of CATI (Chillers) and CATII (Non-Chiller) equipment. What's in it for you: • Factory Certified Training, Refrigeration Certification or other professional on the job training in the HVAC Industry. • The opportunity to work on all types of commercial equipment and cutting-edge technologies such as Intelligent Equipment, Magnetic Bearing Technology and VRV|VRF Technology. • Thermosystems provides technicians with vans, laptops, mobile devices, and other technologies. What you will do: • Perform maintenance of all HVAC & applied equipment and on-site start-up procedures. • Repair and replace defective equipment, components, or wiring. Perform intermediate to advanced independent diagnostics, troubleshooting, pipefitting, and brazing of equipment. • Conduct warranty service application by independently inspecting and testing systems to verify functionality for equipment. • Verify functionality of new equipment. Educate customers on proper use of equipment, maintenance schedule, and operating manual. • Problem-solve issues using reasoning and logic. • Communicate with individuals who installed the system. • Program new control systems using touchscreens and computers. • Assist the owner's representatives to demonstrate that the system has been set up properly. • Document actions taken on the jobsite to be included with project report. • Direct discussions with building owners to assist with ongoing maintenance and service. • Prepare wiring diagrams. • Wear personal protective equipment when completing service tasks. • Complete jobsite hazard assessment prior to initiating service and adhere to safety policies and OSHA guidelines. • Demonstrate professionalism in appearance, verbal, and written communication. Interact with customers by offering status reports of service before, during, and after each call. Explain technical information to technical and non-technical audiences. • Communicate potential sales opportunities to the sales staff through the quote process. • Record and report billing, inventory, timecards, technician tip reports, product quality reports (PQR), and articles as required. • Basic data entry and ability to navigate the use of email, internet, word processing programs. Download programs into equipment and micro controllers. Analyze trend data to ensure optimal performance. • Ensure standards, policies, procedures, and maintenance of a clean work area are always upheld. Qualifications: Must have: • Associate degree or equivalent from two-year college or technical school, with a certificate in Heating, Ventilation, and Air Conditioning. • 5+ years related experience with increasing responsibility; or 7+ related experience; or equivalent combination of education and experience. • Valid driver's license and acceptable driving record. • State license or certifications as required by the market. • EPA approved Universal Technician Certification required, as necessary. If you're looking for an engaging career with growth opportunities in a supportive environment, you'll love a career at Thermosystems!

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