Assistant Field Engineer Jobs in Naperville, IL (NOW HIRING)

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
• 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!

As an HVAC Controls Field Engineer you are responsible for providing job site oversight for installation of Building Automation Systems & Controls. Your supervision is critical to the success of our contracting controls business: installation, programming, system integration, functional testing, commissioning, and owner-training for a building automation system. You will collaborate with Design Engineers, System Integrators and Programmers to ensure that projects are delivered on time and fully functional.

• Supervise electrical subcontractors installation of low voltage network wiring
• Assist in trim and terminating wiring to field devices (e.g. sensors, actuators, etc.)
• Assemble control panels
• Perform field quality control of field wiring
• Perform field functional testing of devices
• Perform field functional testing of programmed sequence of operations
• Perform commissioning of customer graphics
• Document field verification and testing
• Demonstrate building automation system to owner/operators
• Troubleshooting hardware & software (e.g. field program controllers, network Integration of controllers, etc.)
• Stay updated with the latest industry trends and technologies.
• Understand project scope and execute duties in timeline required
• All other duties assigned

• B.S. Mechanical Engineer, Electrical Engineering or a related field
• 10+ years of HVAC controls experience
• Strong problem-solving and decision-making abilities, with a focus on practical solutions that exceed client expectations
• Excellent people skills, with the ability to build rapport and establish trust with internal and external stakeholders
• Demonstrated ability to work independently and collaboratively in a demanding environment
• Working knowledge using Microsoft 365 suite + Visio + Bluebeam + Niagara Workbench

The typical annual base salary for this position ranges from $100,000 - $140,000 in Illinois. The range displayed represents the pay range for all positions in the job grade in which this position falls. Individual base pay will depend on a wide range of factors including your skills, qualifications, experience, and location.

If you're looking for an engaging career with growth opportunities in a supportive environment, you'll love a career at Thermosystems! Building a more sustainable planet. Creating comfortable, healthy spaces for people to connect, live and work. Perfecting the air we share.

Daikin Applied is not just an HVAC company. We're part of a global technology powerhouse that uses Heating, Ventilation and Air Conditioning (HVAC) to transform the world. We're innovators and leaders. Not only as a business, but as individuals. And we are honored to say we were named to Forbes' America's Best-In-State Employers list for 2025, ranking #1 in Minnesota for Manufacturing and Engineering. You see, we're not just innovating on the outside. We're innovating on the inside to unlock people's unlimited potential and bring out the diverse and groundbreaking ideas that will help us solve today's most pressing challenges. That's why Daikin offers more than a job. Here's where you'll be heard, be valued, belong -- and be able to make your mark. Over the past several years, we’ve proudly welcomed several organizations into our family, each bringing unique strengths, deep expertise, and talented teams. As we continue to grow, these partners play a vital role in expanding our capabilities and shaping the future of our organization. Whichever Daikin Applied company you join, you’ll be part of a unified, supportive environment where you can make an impact and grow your career.