Heating, Cooling, and Plumbing Experts in Knoxville, TN

A1-Certified Service Inc in Knoxville, TN has the experience and team ready to handle all your heating, cooling, and plumbing needs to your home or place of business. We also strive to make your home energy efficient with insulation services. We provide the best in class in home performance which will help you cut costs on energy bills. Call (865) 691-5088 today to get started!

We have all had this happen at some point or another. You come home and your home's heating or cooling is not working, or you've turned on the hot water and only cold water is coming out. Rest assured, we offer 24-Hour Emergency Service when you need it most!

Our HVAC and Plumbing Services

Technician is Checking Air Conditioner—Cooling Systems in Knoxville, TN

Air Conditioning

AC unit repairs and installation. Preventative maintenance plans available.
Technician Checking Water Pressure—Cooling Systems in Knoxville, TN


Heating replacement and repairs.
Plumbing Service—Cooling Systems in Knoxville, TN


Full-Service Residential & Commercial Plumbing Repairs, Drain Cleaning, Sewer Services, and Water Heater Replacements.


Home performance insulation for air sealing and an energy-efficient home.
Home of the $79 HVAC service call. Get in touch with us today!

Committed to Excellence Since 2000

Our commitment is to provide your business or home with quality, comfort, and energy efficient solutions. Our mission is to deliver best in class services through continuous education, and with innovative solutions to everyday applications in comfort and safety. We are driven to provide both technologically advanced and sustainable products and services, which will reduce your utility bills and your carbon footprint on our environment, while also increasing your home's safety and comfort. A1-Certified Service Inc wants to provide each and every customer with the best quality products and services that we expect ourselves.

Qualified and Friendly Services

New and Replacement System Installation

A-1 Certified Service, Inc. offers you options to meet your budget needs when you have to replace your heating and air system. If you are planning on building a new home, we are here to help you with the design and installation of your new home's HVAC and Duct System.

Full Service Plumbing

We understand the importance of keeping your plumbing working at all times. Our licensed experts at A-1 Certified Service are here to provide you with any plumbing repairs or replacements you may need.

We Service all Makes and Models

A-1 Certified Service, Inc. services all makes and models of HVAC. Our technicians are NATE (North America Technician Excellence) & EPA certified.

Residential and Commercial Maintenance Service Agreements

Routine Maintenance will ensure your system is running at its best performance possible to keep you comfortable throughout the year.

Home Performance

A-1 Certified Service, Inc. recognizes your home is a system, which impacts your comfort and your wallet. Home Performance is the science of how to make your home more comfortable, safe, healthy, and energy efficient. Ask our comfort specialist what A-1 Certified Service, Inc. can do to improve your home's performance.

Air & Duct Sealing

Air Sealing/Infiltration Reduction and Duct Sealing is the best way to reduce your home's utility bill and carbon footprint. A-1 Certified Service, Inc. has the tools to show you where your home is leaking air into and out of your home. We have the solutions to significantly reduce air loss, improve your home's comfort and save you money.


Proper insulation will keep your home warm in the winter and cool in the summer. We offer both fiberglass and cellulose to aide in your home's insulation needs.

Financing Available

We understand the importance of both your comfort and safety and we are here to help! Whether you have to purchase a new HVAC system or are in need of a major Plumbing and/or Heating and Air repair, A-1 Certified Service, Inc. can provide the financing option to meet your needs. We have on-the-spot financing in your home, which includes a variety of financing plans with no-money down or 0% interest.

TVA Escore

A-1 Certified Service, Inc. is a proud member of the TVA Escore (QCN) Quality Contractor Network. Escore provides rebates for many home performance upgrades, such as new HVAC systems, duct system replacement, air sealing, duct sealing, insulation, and new Heat Pump Water Heaters. Click here and sign-up to get your Escore rebates working for you!
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Call (865) 691-5088 to schedule a consultation today!