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, heating, and plumbing 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 (The philosophy and science based on the premise that homes should be safe, healthy, comfortable, durable, and efficient), and Full-Service Plumbing. 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.
Modern Air Conditioner—AC Service in Knoxville, TN

Our Team


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 Knoxville's Community Action Committee (CAC), Knoxville's KEEM (Knoxville Extreme Energy Makeover) and the Oak Ridge's MOREE (Make Oak Ridge Energy Efficient) programs.
Call (865) 691-5088 to learn more about what we can do for you.