Mechanical Engineer III

Lennox International; Carrollton (TX); On-site; USD 97,000 - 127,000; Full time

Benefits offered by this job

Tuition reimbursement

Medical, dental, and vision insurance

401(k) retirement plan

Disability insurance

Paid parental leave (8 weeks)

Job summary

Lennox International is seeking a Mechanical Engineer III to lead the design, development, and validation of HVAC systems and components, including coils and air handlers, as a senior IC driving technical solutions across engineering, product management, manufacturing, and test teams.

You will own subsystem engineering, define testing plans, analyze data, and mentor junior engineers while ensuring performance, cost, manufacturability, and regulatory compliance.

Qualifications

• Bachelor’s degree in Mechanical Engineering or related field.
• 5–8+ years of relevant engineering experience.
• Strong thermodynamics, heat transfer, and airflow knowledge.
• Experience with CAD tools such as SolidWorks or Creo.
• Demonstrated ability to independently lead design and development efforts.

Responsibilities

• Lead design and development of mechanical systems from concept to production.
• Own subsystem engineering with CAD models, drawings and specs.
• Balance performance, cost, manufacturability and reliability in design decisions.
• Define and support system testing with lab teams.
• Analyze test data and lead design iterations to meet requirements.
• Support NPI, product updates and platform standardization.
• Lead root cause analysis for field, warranty and production issues.
• Collaborate with cross-functional teams across product, manufacturing, sourcing and sales.
• Mentor junior engineers and review technical work.

Skills

Mechanical engineering

Thermodynamics & heat transfer

CAD experience (SolidWorks/Creo)

Independent leadership

Analytical problem solving

Education

Bachelor’s degree in Mechanical Engineering

5–8+ years engineering experience

Tools

SolidWorks

Creo

Job description

Who We Are

Lennox (NYSE: LII) Driven by 130 years of legacy, HVAC and refrigeration success, Lennox provides our residential and commercial customers with industry-leading climate-control solutions. At Lennox, we win as a team, aiming for excellence and delivering innovative, sustainable products and services. Our culture guides us and creates a workplace where all employees feel heard and welcomed. Lennox is a global community that values each team member’s contributions and offers a supportive environment for career development. Come, stay, and grow with us.

What Drives Success

We are seeking a Mechanical Engineer III to lead the design, development, and validation of HVAC systems and components, including evaporator coils and air handlers. This role is a senior-level individual contributor responsible for driving technical solutions, supporting product strategy, and collaborating across engineering, product management, manufacturing, and test teams to deliver high-quality, cost-effective products.

Key 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

What We Are Looking For

Required

• 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

• 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)

What We Offer

Compensation

This is a salaried exempt role. The starting salary range for this role and market is between $97,000 - $127,000 annually. Factors that may affect starting salary include geography/market and the skills, education, experience, and other qualifications of the successful candidate. Employees in this role are also eligible for an annual bonus in accordance with the terms of the Company’s applicable plan. Employees in this role are not eligible for overtime.

Benefits

Subject to applicable eligibility requirements, the following benefits are offered for this role: 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.

Depending on date of hire, and subject to applicable eligibility requirements, new employees in this role also receive 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.

Our Culture

At Lennox, our Core Values of Integrity, Respect & Excellence are ingrained in the fabric of the organization. They define our culture – which is about how we do business and how we treat others. Lennox is not just a workplace; we are a global community that values each team member’s contributions. As an equal opportunity employer, we are committed to recruit, develop, and retain talented individuals from a wide range of backgrounds, ensuring that everyone has the opportunity to succeed and contribute to our continued growth and success. At Lennox, you’ll take pride in our brands, knowing you are part of something special.

Disclaimers: The compensation and benefits information is accurate as of the date of this posting. Lennox reserves the right to modify this information at any time, with or without notice, subject to applicable law.