Principal Mechanical Engineer

What you will do

Johnson Controls is hiring! The Mechanical Engineering Simulation and Modeling Engineer performs conventional and less complex mechanical engineering assignments involving the design and development of the organization’s core thermodynamic system products. This role focuses on the development, validation, and deployment of computer‑based models for chillers, heat pumps, and their components. The engineer will also plan and interpret laboratory test results to validate and tune simulation models. This position is based in New Freedom, PA, and candidates are expected to be onsite 3 days per week. Various relocation packages are available.

How you will do it

• Develop, validate, and deploy computer models to simulate the performance of thermodynamic systems.

• Model chillers, heat pumps, and component‑level systems including compressors, heat exchangers, pumps, valves, motors, and VFDs.

• Build and refine simulation models for chiller systems.

• Plan physical tests and interpret experimental results from engineering laboratory environments.

• Use laboratory data to validate, calibrate, and tune simulation models.

• Bachelor’s degree (or foreign equivalent) in Mechanical Engineering, Chemical Engineering, or a related engineering field.

• Minimum 2 years of professional work experience focused on simulation of thermodynamic systems.

• Suggested minimum of 3 years of relevant experience for Engineering II level.

What you will need

Required

• Strong understanding of fluid dynamics and heat transfer.

• 5+ years of experience with applied thermal system modeling in a professional environment.

• Experience analyzing experimental test results in a laboratory environment.

• Experience validating computer models using laboratory data.

• Proficiency with FORTRAN and C#.

HIRING SALARY RANGE: $90,000 - $120,000 (Salary to be determined by the education, experience, knowledge, skills, and abilities of the applicant, internal equity, and alignment with market data.) This position includes a competitive benefits package. The posted salary range reflects the target compensation for this role. However, we recognize that exceptional candidates may bring unique skills and experiences that exceed the typical profile. If you believe your background warrants consideration beyond the stated range, we encourage you to apply. To support an efficient and fair hiring process, we may use technology assisted tools, including artificial intelligence (AI), to help identify and evaluate candidates. All hiring decisions are ultimately made by human reviewers. For details, please visit the About Us tab on the Johnson Controls Careers site at