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Lennox Principal Mechanical Engineer in Carrollton, Texas

Company Overview

Lennox International (LII) is a leading global provider of innovative climate control solutions for heating, ventilation, air conditioning, and refrigeration (HVACR) markets.

Beginning over a century ago, Lennox International has built a strong heritage of Innovation and Responsibility. Our position as an innovation leader continually inspires us to promote more efficient energy use and a healthier environment through our product operations. Our engaged and diverse workforce is committed to providing climate control solutions that provide the most value and comfort for our customers.

We are proud to have instilled a shared sense of responsibility and commitment among our approximately 10,000 employees located throughout North America, South America, Europe, and Asia.

Note: We do not accept resumes from headhunters, placement agencies, or other suppliers that have not signed a formal agreement with us.

Job Description

As the Principal Mechanical Engineer, reporting to the Director of Components and Supplier Engineering, you will investigate technological advancements or new technologies in vapor compression systems and provide conceptual or practical applications for these technologies within Lennox business units.


  • Develop reliability/design verification plans for each component/technology based on product design requirements and reliability goals

  • Provide design input to improve component/product reliability and meet specification when necessary

  • Provide detailed test plans and test reports

  • Provide leadership in the HVAC components functional area

  • Manage multiple projects, work with cross-functional teams and deliver on performance, quality, cost and schedule

  • Conduct verification and reliability testing on Components and sub systems

  • Ensure Lennox drawings and specifications are understood and followed by the suppliers in design and testing

  • Perform supplier engineering capability evaluations and recommend supplier selection and improvements

  • Conduct characterization studies to define the critical performance features, CTQ (Critical to Quality) and related requirement for process capability

  • Prioritize and complete tasks to meet deadlines

  • Interact with a wide variety of individuals and teams to communicate results

  • Lead and provide guidance in the development of product and materials specifications for prototypes and verification testing protocols; coordinate verification testing activities.

  • Provide sustaining engineering support of existing products.

  • Prepare and coordinate verification and validation activities during investigation and design change activities

  • Conduct statistical data analysis to provide risk assessments of a design

  • Assist Supplier Development teams in evaluation of processes to support critical characteristics and proposed changes to product.

  • Optimize component design for performance, efficiency, reliability and cost

  • Support the implementation of these components with documentation, test and reliability plans from supplier selection to Lennox production




  • BS or MS in mechanical engineering; electrical engineering may be considered with the appropriate experience

  • 10 + years work experience in applying various motors, electro mechanical or compression technology in HVAC system design

  • In depth knowledge in design or application of HVAC component qualification (compressor, motors, EEV, TXV or electro mechanical) is a plus

  • Strong understanding of Six Sigma principles

  • Knowledge of DFMEA, PFMEA, quality and reliability procedures is required

  • Willing to travel

  • Knowledge of manufacturing process and failure analysis to identify root cause

  • Exceptional problem solving abilities with strong attention to detail

  • Dynamic “can do” attitude with desire to work with a great team and products

  • Skill in facilitating meetings, making presentations and communicating with cross-functional teams


  • Outstanding 401(k) with company matching and 1-year bonus

  • Employee Stock Purchase Plan

  • Robust Employee Assistance Program

  • Community involvement opportunities

  • Relocation assistance is available!

Job Locations US-TX-Carrollton

Requisition # 2020-22952

Category Engineering

Shift / Hours Regular

Lennox International is an Equal Opportunity Employer and supports a diverse, inclusive work environment.

All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, transgender status, sexual orientation, national origin, genetics, disability, age, or veteran status.

Applicants with Disabilities

If you are an individual with a disability or a disabled veteran who is unable to use our online tools to search and apply for jobs, you may request a reasonable accommodation by contacting us at Recruitment@Lennoxintl.com

E-Verify Participation

For jobs located within the United States, LII participates in the Electronic Employment Verification Program known as E-Verify.

Please visit the E-Verify website for more information on this program.

Diversity & Inclusion Website