Senior Mechanical Engineer – HVAC Systems & NPI Lead

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

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.