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Find Air conditioning pros in Knoxville

Avatar for Relax HVAC, Inc.
Relax HVAC, Inc.
5.0(
32
)
Central A/C - Service or RepairCentral A/C - Service or Repair - For BusinessCentral Humidifier - Repair or Service

Serving Knoxville, MD and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"Kamal was very accommodating with time and he was friendly and fixed my problem inside of 10 minutes!! I would highly recommend Relax Air. As a matter of fact I will call no other vendor for furnace or air conditioning. Can't say enough good things about this experience. Try Relax Air, you wont be disappointed!! E.L. of Ashburn VA"
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+12

Response time1 day
1 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for McCrea Heating & Air Conditioning Services of PA
McCrea Heating & Air Conditioning Services of PA
4.7(
317
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+6 more

Serving Knoxville, MD and surrounding areas

Approved

In business since 1936

Free estimates

Emergency services offered

"My technician, Lily, was right on time. It was her first time to my home and she was very friendly and informative. She explained what went wrong and also showed me how to maintain some things through my routine maintenance. My service call involved a charge as it was Service, labor plus Freon to be added to my unit and the outside unit's battery. Since I have a contract with McCrea, I was not charged for the part that was to be replaced on my unit. My house is slowly cooling down as it was 90 degrees inside my home when she arrived this morning. My house lost the air conditioning on the Fourth of July and on a very hot day. I would highly recommend McCrea Heating and Air Conditioning Services of PA."
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7 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Holtzople Heating, Air Conditioning, & Electrical Services
Holtzople Heating, Air Conditioning, & Electrical Services
4.9(
213
)
Central A/C - InstallCentral A/C - Service or RepairCentral A/C - Install - For Business+6 more

Serving Knoxville, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2002

Free estimates

Emergency services offered

"Tim was our technician. he called telling us when he would arrive. He is very professional, friendly and efficient. The work was performed professionally and was reviewed with me before his departure. The air conditioning was tested and the temperature reset before Tim left. We have used this company previously and we are extremely pleased with all of our interactions with the employees. we will Continue using Holtzople Heating and Air Conditioning Service!!. Five Stars!"
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+47

Response time1 day
Response rate100%
33 neighbors recently requested a quote
Avatar for Tetteris HVAC
Tetteris HVAC
4.7(
192
)
Central A/C - Service or RepairCentral A/C - InstallCentral Humidifier - Install or Replace+1 more

Serving Knoxville, MD and surrounding areas

Approved

In business since 2016

Free estimates

Emergency services offered

"After several years of shoddy furnace repairs, replacements and guesswork from our propane provider, I decided to find another service. I quickly got a call back and appointment from Tetteris Heating and Air. After a brief diagnostic, Greg Shaeffer almost immediately assessed the problem was a malfunctioning gas valve. After replacing and converting the valve, he discovered that the old valve had not been installed or converted properly by the previous company. Greg was very professional, helpful, friendly and didn't mind answering any questions I had. I couldn't be more satisfied with the work and service that Tetteris provided. Highly recommended!"
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6 neighbors recently requested a quote
Recommended by94%of homeowners
Markool Heating & Cooling, LLC
4.7(
21
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+10 more

Serving Knoxville, MD and surrounding areas

Approved

In business since 2019

Free estimates

Warranties offered

"Just started working with Markool this summer and they have been fantastic! When I need service, they are so fast and every person we have interacted with has been polite, knowledgeable and personable. We unexpectedly needed to replace our system during a heat wave and they were super. So responsive and quick. I would highly recommend Markool for all of your HVAC needs!"
Response time7 hrs
4 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for Wenbrooke Services
Wenbrooke Services
4.6(
107
)
Central A/C - Install

Serving Knoxville, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2015

Emergency services offered

Warranties offered

"It was an all-around good service & project. I had a large out-building that used to have electric to it. I wanted to add electric to the building in hopes that if I had to sell, then electric to the building would increase the sale-ability of the property. It was an extensive project. They had to dig a trench from the house to the bldg, add a panel box, run wiring through the 36'x36' 2-story salt-box style bldg, provided light fixtures, outlets, etc... a few days after the project was completed, a large rainstorm washed out some of the trenching. They came out within a day or 2 after the storm & filled back in the collapsed trenching."
Commercial Sign
Dinning room fixture
Commercial Office
Kitchen Pendants
Response time11 hrs
55 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for SPECS Heating & Cooling
SPECS Heating & Cooling
4.8(
17
)
Central A/C - Service or Repair

Serving Knoxville, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Credit card accepted

"Outstanding and professional service! I am so happy my AC problems were resolved quickly. Fredy was able to come out a couple of hours after we talked and on a Saturday. He was very through in his approach to the problem and outlining longer term solutions. His communications skills are great. He was able to explain every step of the process to get my AC on and going. Highly recommended!"
Response time5 hrs
11 neighbors recently requested a quote
Recommended by50%of homeowners
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FAQs for air conditioning projects in Knoxville, MD

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, MD homeowners’ guide to air conditioning services

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