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Find Air conditioning pros in Knoxville

Avatar for Relax HVAC, Inc.
Relax HVAC, Inc.
5.0(
32
)

Serving Knoxville, MD and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"I have used Relax Air services twice in the past. On November 19th my water heater stopped producing hot water, I've called Nasser to come over to assess what needed to be done. On Monday Nov. 21st he replaced my old water heater (21 years old) Nasser is honest and very reliable. He is very reasonable with his pricing (I have compared Nasser's pricing to my next door neighbors water heater replacement cost). I would highly recommend Relax Air. A huge THANK YOU to Nasser...Relax Air is the ONLY company for my Heating And Air Conditioning needs!"
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+12

Response time1 day
10 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Presidential Heating & Air Conditioning
Presidential Heating & Air Conditioning
4.6(
454
)

Serving Knoxville, MD and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1982

Free estimates

Emergency services offered

"The Air Conditioner service man who is Walter Gil gave excellent service for the Air Condition, He had great rapport with the customer and answer all the questions that I asked. I rated him five stars for his services."
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+6

27 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Holtzople Heating, Air Conditioning, & Electrical Services
Holtzople Heating, Air Conditioning, & Electrical Services
4.9(
208
)

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 time12 hrs
9 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for McCrea Heating & Air Conditioning Services of PA
McCrea Heating & Air Conditioning Services of PA
4.7(
317
)

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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5 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for GAC Services
GAC Services
4.8(
292
)

Serving Knoxville, MD and surrounding areas

Approved (Corporate)

In business since 1970

Free estimates

Warranties offered

"GAC services was able to come out for a same day trouble shooting appointment. Jim S arrived on time and was very courteous and professional. He was able to quickly identify the problem with the registers and dampers and able to get warm air flowing to the otherwise very cold areas of the house. In addition, Jim was able to recommend some additional services that would help me achieve the desired evenness of temperature such as an additional return and humidifier for the home. Great experienced master certified technician!"
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61 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Weather Masters Corporation
Weather Masters Corporation
4.7(
124
)

Serving Knoxville, MD and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"Adam was so helpful explaining how the ductless heater/ac unit would fit in my sunroom. His three workers were great. Cleaned up the area after they finished, the job was done in about 4 hours. Got three estimates and Weather Masters was the lowest and could install the next day. I also decided to sign a contract for seasonal checkups on my furnace and central air conditioner. I think anyone would feel comfortable hiring them."
Response time2 days
42 neighbors recently requested a quote
Recommended by99%of homeowners
Avatar for Petro Home Services
Petro Home Services
4.3(
103
)

Serving Knoxville, MD and surrounding areas

Approved (Corporate)

In business since 1903

Emergency services offered

Warranties offered

"

we had a leak problem and the tech came and looked over our equipment, fixed the problem and left. It cost us nothing and we have had their home heating service contracts for over 20 years.  They have NEVER ONCE not shown up or not helped and in the two furnace emergencies we had--they were here with in 1hr. 

We are very happy.


"
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Response time6 days
14 neighbors recently requested a quote
Recommended by86%of homeowners
Markool Heating & Cooling, LLC
4.7(
21
)

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 ARS of Maryland
ARS of Maryland
4.1(
175
)

Serving Knoxville, MD and surrounding areas

Approved (Corporate)

In business since 1945

Free estimates

Emergency services offered

"Misunderstanding between Blue Dot and Baltimore County on the inspection.The unit was not installed according to Baltimore county code. Inspection has failed twice. Unit needs to be 3 feet from connection box. They have come out a couple times since the inspection has failed but the issue has not be resolved. It was clearly explained by Baltimore county what needed to be done. I always initiate the calls with them regarding this issue. I did not feel as if they are taking my situation seriously and I would not work them again. I was not advised I was being charged $75 to pay Baltimore County to inspect the Air Condition install. Promised by Jeff, supposedly, a manager a Rep would be at my house in 20 minutes on 12/17/19, no one showed. Jeff acted confused wanted to take a photo so he could figure out what needed to be done to move an Air Conditioning unit 3 ft from connector. Company trades under Blue Dot HVAC. Richard was very friendly and helpful with accommodating the codes for the County."
New System Installation
1527 neighbors recently requested a quote
Recommended by74%of homeowners
Avatar for JDL HVAC & Plumbing Services
JDL HVAC & Plumbing Services
4.5(
119
)

Serving Knoxville, MD and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"IRE YUSUFF from JDL HVAC SERVICES LLC. was Extremely Professional. Serviced our furnace for the winter, checked everything from every wire to every part to air input/output etc... IRE answered every question and explained a part that needed replaced. He showed the old part and it's voltage that was deficient then the new part and the proper voltage for our unit. He was Extremely Professional and Knowledgeable. We even decided to have him/his company to return again in the Spring to service our air conditioning. We found them through HOME ADVISOR and within 10 minutes of me requesting a quote for maintenance/service JDL HVAC SERVICES, LLC was calling me on the phone. They set up service for the very next day which was a SUNDAY. I would totally recommend them to anyone in need of through/excellent service. THANK YOU!"
Navien Tankless 2023
Navien Tankless 2023
Navien Tankless 2023
Navien Tankless 2023
18 SEER Infinity Heat Pump

+73

Response time5 hrs
17 neighbors recently requested a quote
Recommended by86%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.