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 and 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.

Today, A-1 Certified Service, Inc. is driven to provide you the best in class in Air Conditioning, Heating, Air Distribution, Insulation, Home Performance/Weatherization (The philosophy and science based on the premise that homes should be safe, healthy, comfortable, durable, and efficient).. A-1 Certified Service, Inc. understands that your home or business' comfort and energy efficiency is connected and should be treated as an interconnecting system where all aspects affect each other.

Our Commitment to Our Community

A-1 Certified Service, Inc. is committed to serving our community. We support our community through donations and volunteering to 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 areas, 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 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.