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Notice: Due to COVID-19, we'll be taking extra precautions to keep you & our technicians healthy and safe during these challenging times. Please don't hesitate to call us if you have any questions. - LEARN MORE

“Your Comfort is Our Career” Del-Air Mechanical Contractors, Inc.

Established in 1980, we are proud to be the largest family owned and operated commercial HVAC company in Knoxville, TN. 

Knoxville Commercial HVAC & Plumbing

At Del-Air Mechanical, we understand that no two businesses are the same. Each company differs in size, personnel, building structure, and more. However, one thing that remains the same is the connection between a comfortable work environment and higher production rates. Our skilled technicians take the time to understand our clients’ needs before creating customized heating, cooling, and plumbing solutions. We have helped companies across a variety of markets including educational, retail, office buildings, biotechnology, industrial, and manufacturing.

When it comes to your company, don’t take chances. Call Del-Air Mechanical for unparalleled HVAC and plumbing services in Knoxville, Powell, and surrounding areas.

Unmatched Quality

Commitment & Professionalism
  • Problem Solvers

    We look at the entire problem and provide realistic solutions for each and every job. By sending the same technicians out when possible we build strong relationships with existing customers.

  • Award Winning Service

    We are honored to have received recognition from great organizations including the ACCA and INC 5000. We will continue to innovate in the HVAC community and strive for perfection.

  • Safety First

    We are highly recognized for our Safety & Health Program. Our goal is to always provide a safe working environment for our team.

  • Longevity & Community Driven

    Family owned and operated in Knoxville since 1980. A staple in the community for professional work and stellar customer service.

About Us

Learn more out more about our values, background and team!

Building Relationships

Read reviews from our happy customers!
  • Cannot say enough about everyone at Del-Air!

    “Cannot say enough about everyone at Del-Air!”

    - Katie DePersio, Executive Director, Tennova Health & Fitness
  • Del-Air has been an outstanding partner for us

    “The staff at Del-Air is friendly, personable, and easy to communicate with.”

    - James Lusby, Home Federal Bank
  • I have and will continue to recommend Del-Air to others.

    “We appreciate your service and hope to work with you again!”

    - Ryan Chinn, R&R Properties
  • Trustworthy

    “Excellent craftsmanship!”

    - Elif T
  • Satisfied Customer

    “I would highly recommend using Del-Air!”

    - Ryan D

Meet Your Team

“Your Comfort is Our Career”
  • Dwane  Lay Photo
    Dwane Lay


    In 1980 Dwane launched the business with a single truck. He is now the CEO of one of the only privately owned Mechanical Contracting businesses in the Knoxville area. Little known fact about Dwane: He sold the family car to begin the business and has remained debt free.
  • Randy  Lay Photo
    Randy Lay


    Upon graduating high school in 1989, Randy began his career at Del-Air. He has worked in every aspect of the business including Laborer, HVAC Technician, Project Superintendent, Financial Controller, Project Manager and now Secretary / Treasurer of the business. Little known fact about Randy: He and his wife Carol serve as Foster Parents.
  • Lori  Lay-Sentell Photo
    Lori Lay-Sentell

    Director of Operations

    Lori Sentell has over 20 years in the HVAC business. She has served at Del-Air for over 8 years. Starting out in an Administrative role, Lori now serves as a Project Team Leader in the Service & Building Automation Division. Little known fact about Lori: She has a minor in Spanish.
  • Ledna  Jackson Photo
    Ledna Jackson

    Human Resources & Accounting

    Ledna brings over 30 years of accounting and human resource management experience to Del-Air. As the Chief Internal Operations Officer, she oversees both the Accounting and the Human Resources departments. Little known fact about Ledna: A former classmate used her name in a bestselling novel.

We are proud of our work!

Browse our gallery of past projects.
  • Inc 5000
  • Boys and Girls Club of Tennessee Valley
  • Air Conditioning Contractors of America
  • ACCA Contractor of the Year

Your Comfort is Our Career

Since 1980, Del-Air Mechanical has been helping businesses succeed all across East Tennessee. As a family owned and locally run company, we understand the intricacies of running a successful business. From making sure your employees are comfortable to producing high-quality products, it can be a lot to juggle. The last thing you need to worry about is a broken pipe or a heater on the fritz.

Our Knoxville technicians work with expediency and efficiency because we know that your time is valuable. Our team maintains a robust industrial safety program and continuously trains to ensure quality. When you call our team, you can rest assured you will receive service backed by over 39 years of experience.

Contact Us Today

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