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  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon465
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in Karns - Updated Nov 2026

Avatar for CM Walter Heating & Air LLC
CM Walter Heating & Air LLC
5.0(
24
)
Gas Furnace / Forced Air Heating System - RepairCentral A/C - Service or RepairDuctless Mini-split Heating System - Install or Replace+1 more

Serving Karns, TN and surrounding areas

Approved

Free estimates

Offers commercial services

"Martin was very knowledgeable, an incredible experience with a total air conditioning replacement. He worked with me and my needs and was very professional; I cannot say enough about this guy. I would definitely rate him the highest regard in this area and will definitely be retaining him as my service HVAC technician. Just wow, he saved me thousands of dollars."
1 neighbors recently requested a quote
Avatar for AC's Heating & Air
AC's Heating & Air
5.0(
13
)
Central A/C - Service or RepairDucts & Vents - Install or ReplaceElectric Furnace / Forced Air Heating System - Repair+2 more

Serving Karns, TN and surrounding areas

Approved

In business since 2022

Free estimates

Credit card accepted

"Adam and gracie with ACâ s Heating and air were amazing! They installed new ductwork and vents along with running new 240v wire to an oven for us. They did great work, did it fast and were very affordable. We highly recommend and will use them again!"
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 Air Specialities LLC
Air Specialities LLC
5.0(
25
)
Air Ducts & Vents - Clean

Serving Karns, TN and surrounding areas

Approved

In business since 1988

Free estimates

Warranties offered

"It went great! Kevin and his crew went above and beyond my expectations. From the initial call, to the complete walkthrough free estimate, to the cleaning, Kevin kept us informed throughout the entire process. I asked for a thorough inspection and cleaning, and that is exactly what we got. They thoroughly cleaned and sanitized our complete HVAC system, including all supply lines, registers, and returns. They even removed and thoroughly cleaned the grills. They opened up the trunk lines and cleaned and sanitized them then sanitized with Foster’s 40:80 antimicrobial product. They sent me videos of their work as they were working throughout the house, and I was shocked to see mold growing in the attic unit. They cleaned and treated it, so hopefully our allergy problems will go away. Because they are mold specialists, I asked about a problem we were having with a leaking window. Kevin and his guys caulked the window and treated the interior wall and didn’t even charge me for the extra work. They were not the cheapest quote, but it was so much better than the last time we had vent cleaning, so the extra cost was so worth it! I highly recommend them and look forward to referring them to others and using them in the future."
Response time1 day
1 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for Ducts Air Duct Cleaning, Inc.
Ducts Air Duct Cleaning, Inc.
4.8(
105
)
Air Ducts & Vents - Clean

Serving Karns, TN and surrounding areas

Approved

Super Service Award Winner

In business since 1998

Free estimates

Emergency services offered

"I was first impressed when the owner, Mr Rankin , answered the phone within 2 rings. After explaining what i was looking for , Mr Rankin explained in detail what his company could do as far as duct cleaning of my HVAC system. He was forthright and knowledgeable and answered all my questions regarding his company's reputation and experience. Immediately after our conversation he emailed me a very detailed quite and his company insurance documentation. My appointment was made., and he texted me the names of the technicians. They arrived on time, equipped with booties to wear thru out the house. The work performed took about 4 hours from start to finish. Mr Rankin's techs were extremely polite and very respectful . They also took their tome cleaning up after themselves. We have noticed an immediate improvement, so much so i was considering replacing HVAC unit before i met Mr Rankin. Now the unit is working as it should and my entire hone is very comfotable. I am so happy with the results and if you are considering getting your HVAC ductwork cleaned and sealed , I would highly recommend this company. Good to see great customer service. Thankyou to Mr Rankin and his team of professional technicians"
Response time7 hrs
Response rate100%
Recommended by81%of homeowners
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Heating and Air Conditioning FAQs, answered by experts

The outdoor portions of air conditioners are designed to weather the rain, so you don’t need to worry about it. An awning or roof will help protect them from snow or falling debris, which can do more damage. This is true of both window AC and outdoor units for larger systems.

Running a window air conditioner unit costs about $0.06 to $0.88 per hour. Choosing the correct size air conditioner can help it run more efficiently.

No, it's not advisable to only replace the outside AC unit connected to your system. AC units are designed to work as a cohesive system, and older units work differently than newer units. Therefore, replacing only one component can lead to incompatibilities that affect the system’s performance. Replacing one component can void your warranty, costing you money for repairs.

Yes, ventless portable air conditioners exist, and not all standard portable air conditioners must be vented through a window.

Ventless portable units, often called evaporative coolers, do not have exhaust hoses. They use a water reservoir and a cooling pad to add moisture to the air, making it feel cooler. These units work best in dry climates because humid areas cannot absorb much additional moisture.

For standard portable air conditioners that do require venting, a window is not the only option; they can also be vented through a door, wall, or ceiling. However, it is essential to vent these units properly. Running a standard portable AC without venting it is counterproductive because it needs to expel heat to cool the room. Failing to do so will only increase the room's temperature.

While it is possible to add Freon to your AC unit yourself, it is not recommended. In fact, the U.S. Environmental Protection Agency (EPA) prohibits the handling of Freon without a license. Freon is a dangerous gas that can cause irreversible damage to your AC or yourself if not installed correctly. It is worthwhile to hire a professional to add Freon to your AC.

The Karns, TN homeowners’ guide to heating and air conditioning services

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