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Top-Rated Air conditioning pros in Knoxville - Updated Nov 2026

Avatar for Admiral Heating and Air Conditioning, Inc.
Admiral Heating and Air Conditioning, Inc.
4.9(
32
)
Central A/C - InstallCentral A/C - Service or RepairDuctless Mini-split A/C - Install or Replace

Serving Knoxville, TN and surrounding areas

Approved

In business since 2000

Free estimates

Credit card accepted

"We have been using Admiral Heating and Air for both service and new installation for 16 years. They are always prompt and do an excellent job. The spring and fall maintenance program is a great way to make sure everything is in good working order. John is the best!"
Gas Pack
Gas Pack and Split Air Conditioner
American Standard Air Handler
2 American Standard Heat Pump Condensing Units
American Standard Heat Pump

+269

Recommended by92%of homeowners
Avatar for Standard Air Conditioning, LLC
Standard Air Conditioning, LLC
4.8(
54
)
Central A/C - Service or Repair

Serving Knoxville, TN and surrounding areas

Approved

In business since 2017

Credit card accepted

Customers say: Quality work

"The response time was quick. They were genuinely interested in doing the job quickly, efficiently and at a reasonable price. The repairman took pictures so we could see exactly what was being done. I would not hesitate using Standard Air Conditioning again."
Standard AC
Standard AC
Standard AC
AC Service Call
Powell Install

+2

Response time3 hrs
18 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for CM Walter Heating & Air LLC
CM Walter Heating & Air LLC
5.0(
24
)
Central A/C - Service or Repair

Serving Knoxville, TN and surrounding areas

Approved

Free estimates

Offers commercial services

"We needed some help with an electronic air cleaner we had installed by another hvac company (they claimed that the unit was working properly) Martin came by and confirmed that there was an issue. He spent time talking to the manufacturer and then helped us solve the issue in a timely and cost effective manner. He also did a routine yearly cleaning of our A/C unit and the furnace, and we are very pleased with the work and experience. 10/10 for communication, ease of scheduling, and value of the work. I highly recommend Martin for all of your HVAC needs"
1 neighbors recently requested a quote
Avatar for John H. Coleman Co LLC
John H. Coleman Co LLC
4.8(
103
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceCentral Humidifier - Install or Replace

Serving Knoxville, TN and surrounding areas

Approved (Corporate)

In business since 1945

Free estimates

Emergency services offered

"Since I have two furnaces, two air-conditioning units and a whole house air filtration system, it was too expense for me to afford the yearly service costs. Ed, the technician, and Steve, the Service Manager, helped me find filters that will help with my allergies and asthma and yet were affordable. I used the "Comfort Care" plan, which has discounts for parts and includes service for all my units."
Additional Photos
Additional Photos
Additional Photos
JHCC Office/Shop
Heat Pump Repair

+3

11 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for AC's Heating & Air
AC's Heating & Air
5.0(
13
)
Central A/C - Service or Repair

Serving Knoxville, TN and surrounding areas

Approved

In business since 2022

Free estimates

Credit card accepted

"AC Heating and Air were punctual, tidy and thorough and last but not least they were friendly! All characteristics that are very important to me! Would definitely call them to come out again if needed."
Adam Installing Ductwork
A Couple Finished Runs
Adam Installing Fresh Air Vent
Gracie Wiring Indoor unit
Trunk and Runs Installed by Adam and Gracie

+1

Response time5 hrs
Response rate97%
Recommended by100%of homeowners
Avatar for Brown's Heating & Air
Brown's Heating & Air
4.5(
85
)
Central A/C - Service or Repair

Serving Knoxville, TN and surrounding areas

Approved

In business since 2013

Free estimates

Emergency services offered

"My air went out during the night on July 29, forecast was for 95 degrees that day. After waiting 2 hours for a callback from another company, I called Calvin and he arrived just after lunch. He quickly diagnosed and replace my outdoor fan motor and had me back up and running."
Our work
Our work
Response time5 hrs
Response rate87%
5 neighbors recently requested a quote
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FAQs for air conditioning projects in Knoxville, TN

Most professional HVAC technicians require two to three hours to complete an expansion valve replacement. The timeframe depends on your unit's accessibility and whether additional repairs are needed. The process involves recovering refrigerant, removing the old valve, installing the new component, and recharging the system. Scheduling during less busy seasons may result in more convenient appointment times.

Operating your air conditioner with a malfunctioning expansion valve isn't advisable. Continuing to run the system could potentially damage other components, particularly your compressor, which is significantly more expensive to replace. If you notice performance issues like inconsistent cooling or unusual noises, it's best to have your system inspected before continuing regular use.

Expansion valves don't have a standard replacement schedule, as their longevity depends on system usage, maintenance frequency, and environmental factors. Regular professional maintenance helps identify potential valve issues before they cause system failure. Having your HVAC system serviced annually allows technicians to monitor component condition and recommend preventative replacements when necessary.

Refrigerant leaks require prompt professional attention. If your expansion valve is leaking, you'll likely notice reduced cooling performance and possibly hear hissing sounds near the unit. Addressing leaks quickly prevents further system inefficiency and avoids the environmental impact of released refrigerant. Your HVAC technician will need to repair the leak and recharge the system with the proper refrigerant type and amount.

Because many AC issues present similar symptoms, professional diagnosis is recommended. Problems like inadequate cooling, inconsistent temperatures, or strange noises could indicate expansion valve issues, but might also stem from refrigerant leaks, electrical problems, or airflow restrictions. A qualified HVAC technician has the tools and expertise to accurately identify the root cause and recommend appropriate repairs.

The Knoxville, TN homeowners’ guide to air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.