Mechanical Engineer III

Lennox (NYSE: LII) delivers industry-leading climate-control solutions built on 130 years of HVAC and refrigeration expertise. We win as a team, fostering a culture of excellence, innovation, and sustainability. Our workplace values every employee’s voice and supports long-term career growth within a global, inclusive community.

About the role

We are seeking a Mechanical Engineer III to lead the design, development, and validation of HVAC systems and components such as evaporator coils and air handlers. As a senior-level individual contributor, you will drive technical solutions, support product strategy, and collaborate across engineering, product management, manufacturing, and test teams to deliver high-quality, cost-effective products.

Responsibilities

• Lead design and development of mechanical systems and components from concept through production
• Own subsystem or product-level engineering execution, including CAD models, drawings, and specifications
• Drive design decisions balancing performance, cost, manufacturability, and reliability
• Define and support system testing and validation activities in collaboration with lab teams
• Analyze test data and lead design iterations to meet performance and regulatory requirements
• Support new product introductions (NPI), product updates, and platform standardization efforts
• Lead root cause analysis and resolution of field, warranty, and production issues
• Partner with cross-functional teams (product management, manufacturing, sourcing, lab/test, and sales)
• Mentor junior engineers and review technical work for quality and accuracy

Requirements

• Bachelor’s degree in Mechanical Engineering or related field
• 5–8+ years of relevant engineering experience
• Strong understanding of thermodynamics, heat transfer, and airflow systems
• Experience with CAD tools (e.g., SolidWorks, Creo, or similar)
• Demonstrated ability to independently lead design and development efforts
• Strong analytical and problem-solving skills

Preferred Qualifications

• HVAC system design experience (coils, air handlers, or similar equipment)
• Familiarity with AHRI, DOE, or other regulatory standards
• Experience working in cross-functional product development environments
• Knowledge of manufacturing processes (sheet metal, assembly, heat exchangers)

Pay

Starting salary range for this salaried exempt role is $97,000 – $127,000 annually, depending on geography, skills, education, and experience. Eligible for an annual bonus under the Company’s applicable plan; not eligible for overtime.

Benefits

• Tuition reimbursement
• Medical, dental, and vision insurance
• Prescription drug coverage
• 401(k) retirement plan
• Short-term disability insurance
• 8 weeks paid birthing leave
• 2 weeks paid bonding leave
• Life and long-term disability insurance
• Up to 12 days paid time off, 2 paid well-being days, 1 paid volunteer day, 12 paid holidays, and 3 floating holidays per year (eligibility and accrual dates apply)