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AA-AIR Company is the leading HVAC company in Knoxville, TN, for your furnace service needs. We service and repair all makes and models. If you need furnace service, we are the company to call. Our skilled technicians are qualified to solve just about any repair or installation that you throw at us.

Furnace Repair

Don’t get left in the cold! Is your furnace acting up, blowing cold air, or making too much noise? Our experienced team of professionals is here to keep your home warm and cozy. We repair all makes and models, and we will never try to sell you a service that you don’t need. Our technicians are honest and hard working, and we’re always transparent and fair about the work we do.

Furnace Replacement

Sometimes a repair is not sufficient to fix your furnace. Sometimes a new furnace is the most cost-effective and energy-efficient way to go. We will always be honest with you about a possible furnace replacement. We value our time and your money––we don’t want to perform repairs or service on an appliance that is in need of replacement.

If you do need a furnace replacement, we know how overwhelming it can be. Here are some of the frequently asked questions about furnaces that we get from some of our Knoxville residents:

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What Are The Different Types Of Furnaces?

Single Stage: A single-stage furnace has only one stage of operation. It can either be turned on or turned off.

Two Stage: A two-stage furnace has two settings––full and half speed. This is a more efficient way to heat and provides for better comfort, because it can move the air at a slower pace.

Variable Stage or Modulating: A variable-stage or modulating furnace modulates the speed and heat output based on the temperature outside and the desired comfort level. This furnace only works as much as you need it, making this type the most energy-efficient type of furnace.

What Is AFUE?

AFUE, or Annualized Fuel Utilization Efficiency, is a measure of furnace-heating efficiency. The higher the AFUE, the more efficient the furnace.

What Size Furnace Do I Need?

We can calculate the correct size furnace for your home. The number of BTUs, or British Thermal Units, needed to heat your home is dependent on a number of variables. Contrary to what you might think, a bigger furnace may not necessarily mean more heating power for your home. Call us at AA-AIR Company, and we can set up an appointment to calculate the furnace size you might need.

AA-AIR Company

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Gas Furnace Installation in Knoxville, TN 37931

Performed by

“We had great service every step of the way. All employees were prompt , professional and courteous. We bought a new unit and Patrick made sure we had a clear understanding on how to operate the system and answered all our questions in a clear manner. I would highly recommend them to others”

– Lynn J.

Gas Furnace Installation in Knoxville, TN 37918

Performed by

“Patrick, Chris and Kevin couldn't ask for more professional group of men. Very friendly and explained the process. Very conscious of home and keeping it clean. Overall was a great experience and will definitely use your services again and hopefully get this crew!!


– Sandy D.

Gas Furnace Replacement in Powell, TN 37849

Performed by

“Very pleased with our Heating and Air units. Everyone did a great job.”

– Gail O.

Gas Furnace Replacement in Knoxville, TN 37918

“The gentlemen who replaced our furnace were extremely courteous and efficient.”

– Glenda J.

Gas Furnace Maintenance in Knoxville, TN 37920

Performed by

“Mr,Kimble arrived on time. He was professional, friendly and did a great job! Thank you, As-Air.
Nancy Roberson”

– Nancy R.

Gas Furnace Maintenance in Knoxville, TN 37919

Performed by

“Prompt and courteous. Very timely on appt. scheduling. Thanks!”

– Sandra G.

Gas Furnace Maintenance in Powell, TN 37849

Performed by

“Technician, John Key was professional and courteous. He performed the maintenance that came with the purchase of this unit which was installed in October. We have no complaints and felt the service provided was valuable and this company appreciates my business. After reviewing bids from several competitors, this seemed to be the best choice for our home. We would recommend AA-Air again with no hesitation.”

– Debbie H.

Gas Furnace Maintenance in Knoxville, TN 37921

Performed by

“John K. came to do our annual furnace check up and cleaning. He arrived on time and prepared us for the upcoming winter. He was very professional and courteous and we highly recommend him and AA-Air.”

– Amy H.

Gas Furnace Maintenance in Knoxville, TN 37922

Performed by

“Phil did an excellent job checking out our furnace for the winter season. He is always very professional in explaining what he has done .”

– Al H.

Trane Hybrid Two Stage Furnace Install in Knoxville TN

“We have already felt the complete comfort level of our home. A very stressless purchase.”




AA-AIR Company provides heating and cooling services in Knoxville, Farragut, Lenoir City, Alcoa, Louisville, Maryville and surrounding communities. Call us at 865-689-5290 or request HVAC service online today!

865-689-5290 865-689-5290

24-Hour Emergency Service Available!

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