A-1 Certified Service

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A-1 Certified Service

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AboutA-1 Certified Service, Inc.

The Trusted HVAC Contractors in Knoxville, TN

Providing Quality Service for Your Comfort for Over 60 Years

For the past 60 years, the experts at A1-Certified Service, Inc. in Knoxville TN have given our customers comfort and peace of mind. We began in the late 1960's when cooling your home was in its infancy. Tom Thomas opened his doors to provide comfort to the homeowners in Central Florida. In the early 1990's, Tom moved to Knoxville, TN, and we have been serving the Knoxville & surrounding communities for over 20 years. In 2012, Tom released the reigns of A-1 Certified Service, Inc. to his daughter, Michele Thomas. Michele is continuing the legacy of providing the highest quality of air conditioning and heating and to ensure each customer receives the comfort they deserve.

Our Commitment to Our Community

A-1 Certified Service, Inc. is committed to serving our community. We support our community through donations and volunteering at our local schools, charities, and Habitat For Humanity. We are proud partners with the TVA EnergyRight. For both retail and their Home Uplift Project, The Home Uplift project covers a multi-regional area and provides limited-income homeowners with energy-efficient upgrades to reduce their utility bills, their carbon emissions, and to elevate the strain on our current electrical grid structure.

A-1 Certified Service, Inc. is also a humble sponsor of the Community Coalition Against Human Trafficking (CCAHT) Michele Thomas, the owner of A1CSI is passionately involved in this organization to lift up those in need as part of her mission in life. CCAHT was established in 2010, the Community Coalition Against Human Trafficking unites and equips Knoxville and all of the counties of East Tennessee to end modern-day slavery through awareness, training, and intervention, while also providing survivors of human trafficking in our community with a safe place to sleep, access to medical care, ongoing counseling, and more. Together, we believe we have the power to make our community stronger, safer, and free of exploitation – for everyone. To learn more, visit ccaht.org.

Client Testimonial

Kasi B.

A-1 did a great job working with us to find a unit that met our needs. Scheduling was fast and the front office was really good at communicating everything. Our technician was fast and clean, going so far as to cover and tape all the clothes in the closet before going into the attic. I’d definitely recommend them!

Penny W.

Appreciate the rapid response from A-1 Certified! Jimmy arrived as scheduled, was kind and courteous, identified the issue and promptly had the problem resolved.

Eddy F.

Jimmy and his sidekick (dang it, I’ve already forgotten his name) were on-time, friendly, confident, quick and explained things well.

Lugene B.

The whole team at A-1 are absolutely amazing. They all went above and beyond to do an absolutely stellar job at my house installing a new heat and air system and duct work. Besides all of them being very professional they are also very kind, caring and personable. They get a 1000 + star from me.

Frank L.

Jimmy was prompt, professional and very informative concerning the repair and how my maintenance plan helped in the response time and discount.

Jeff W.

The tech was courteous and knowledgeable. He quickly showed me the problem and fix. It was simple and I’m glad it wasn’t anything more. The value of his visit is that he had the knowledge and skill to go to the simplest solution first, something I didn’t have. If that wasn’t the problem he would have had to go to the next level which I’m secure in the fact that he had the same knowledge and skill. Worth it.