A-1 Certified Service

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About Us

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.

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Client Testimonial

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Alex R.

Jamall and Ed were both great – prompt and professional service

Bart W.

Everyone that I worked with at A-1 was excellent. Michele consulted with me about different options to address the issue that I was having with my existing HVAC system. She was very patient and knowledgeable. Josh and Tommy did a great job with the installation. I am very satisfied with the experience and look forward to a more comfortable house.

Justin B.

I’ve had bad experiences with other companies and their HVAC maintenance plans (like having to chase them down for the agreed-upon service). Not with A-1 certified. They called to remind me that I was due and to schedule my apt! Ash was our tech and she was early, professional, and extremely friendly. Highly recommended!!

Ryan B.

Kris, Tommy, and the crew were great. Friendly enough, worked hard, cared about doing a good job, took the time to explain what they were doing and why… My family and I truly appreciate everything they did for us.

Suzanne R.

This family-owned business has always been our first choice for all of our AC/heating needs. Juan was prompt, courteous, helpful, and thorough. He answered my questions and explained in ‘this human has no freaking idea how the whole AC thing works’ terms – and I have to say, I truly appreciate that!! Juan is an asset. Thank you! Y’all are the best!

Becky M.

Very positive and friendly. Thank you. Would not have had to make a visit if the thermostat had been calibrated when installed.!