What you will do
Johnson Controls is seeking a Senior Mechanical Design Engineer! In this role, you will be responsible for mechanical analysis, detailed design, subsystem integration, and overall mechanical performance of HVAC equipment across EnviroTec air-handling, fan-coil, and blower-coil platforms. You'll support newproduct development, sustaining engineering, prototyping, laboratory validation, and manufacturing execution. You will have the opportunity to collaborate closely with electrical, controls, test lab, compliance, sourcing, product management, and operations teams to deliver marketleading, safe, compliant, serviceable, and costeffective HVAC products.

You will lead complex and exciting mechanical development effortsspanning sheet metal design, thermal/fluid performance, airmoving systems, heatexchanger integration, mechanical safety features, A2L refrigerant adaptations, structural integrity, DFMEA, and fieldservice considerationswhile contributing technical leadership across NPD teams.

This position is onsite based in Largo, FL. Candidates must be commuting distance to the facility, or able to relocate. Johnson Controls offers various relocation packages depending on your needs.

How you will do it

• Mechanical Design & System Integration
• Perform mechanical analysis and detailed design for AHUs, FCUs, BCUs and related subsystems including sheet metal, enclosure structures, panels, fan/motor assemblies, coil integration, and airflow pathways.
• Develop innovative design solutions for custom HVAC equipment based on customer-specific requirements and product performance targets.
• Execute design improvements that optimize manufacturability, serviceability, acoustics, energy efficiency, and product quality.
• Create and maintain mechanical engineering standards, CAD models, technical documentation, and design specifications.
• Develop design rules and logic used in configurable/dynamic BOM generation.
• Mechanical Compliance, A2L Adaptation & Safety Requirements
• Interpret and implement UL 60335-2-40 mechanical safety and A2L refrigerant requirements for clearances, airflow paths, compartment construction, and enclosure integrity.
• Coordinate with compliance partners and agencies (e.g., Intertek/ETL) to validate mechanical requirements and securement tests.
• Ensure mechanical designs meet relevant safety, installation, and regulatory standards.
• Lab Validation, Prototypes & Testing
• Define and execute test plans in partnership with the Largo Test Lab (airflow performance, thermal testing, vibration, structural integrity).
• Lead prototype builds and fitup verification for assembly feasibility and service access.
• Oversee testing of fans, motors, mechanical components; analyze data and drive corrective actions.
• Manufacturing, Sourcing & CrossFunctional Collaboration
• Support manufacturing engineering with BOMs, routings, assembly sequencing, and DFM/DFA improvements.
• Evaluate mechanical vendors and qualify new components including fans, bearings, heating elements, insulation materials, and assemblies.
• Provide mechanical guidance to marketing, applications, sales engineering, service, and field teams.
• Generate clear and accurate drawings, installation details, and mechanical instructions.
• Support PFMEA reviews, rootcause analyses, corrective actions, and engineering change processes.
• Maintain consistency with Largo drafting/documentation standards and mentor drafters/designers.

What we look for
Required

• Bachelors Degree in Mechanical Engineering.
• 5+ years of mechanical engineering experience in product development.
• 5+ years of 3D CAD software experience.
• Experience designing sheetmetal assemblies.

Preferred

• HVAC industry experience
• Experience with lab testing, vibration/structural analysis, acoustics, or CFD.
• Knowledge of sheet-metal fabrication, brazing/welding, fastening, gasketing, and insulation.
• Understanding of DFMEA, DFM/DFA, cost modeling, and value engineering.
• Experience with configurable platforms and dynamic BOM logic.
• Crossfunctional experience with test labs, compliance, sourcing, and service.
• Understanding of thermodynamics, heat transfer, and airflow fundamentals.
• Preferably fan/motor systems, coil integration, heater assemblies, and structural components.

HIRING SALARY RANGE: $100,000 - $125,000 (Salary to be determined by the education, experience,knowledge, skills, and abilities of the applicant, internal equity, and alignment with marketdata.) This role offers a competitive Bonus plan that will take into account individual, group,and corporate performance. This position includes a competitive benefits package. Theposted salary range reflects the target compensation for this role. However, we recognizethat exceptional candidates may bring unique skills and experiences that exceed the typicalprofile. If you believe your background warrants consideration beyond the stated range, weencourage you to apply. To support an efficient and fair hiring process, we may usetechnology assisted tools, including artificial intelligence (AI), to help identify and evaluatecandidates. All hiring decisions are ultimately made by human reviewers. For details, pleasevisit the About Us tab on the Johnson Controls Careers site at

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