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Find Air conditioning pros in Pasadena

Avatar for No-Frost Air Conditioning & Heating, LLC
No-Frost Air Conditioning & Heating, LLC
4.7(
411
)
Central A/C - InstallCentral A/C - Service or RepairCentral A/C - Install - For Business+6 more

Serving Pasadena, MD and surrounding areas

Approved

In business since 1971

Free estimates

Warranties offered

"This is an excellent company. We have used them for year to service our heating and air conditioning units. It became necessary to think about replacing the units. We have two. Decided to replace both at the same time. They came out on a Monday and gave us an estimate and came out on Thursday and Friday to do the work. They totally cleaned up after themselves and made sure everything was working properly. Then they called a few days later to see that everything was working well. I highly recommend this company. All the technicians are polite and competent. The office staff is nice beyond belief. If you need any heating/AC work done, this is the company to do it."
Additional Photos
Additional Photos
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Response time9 hrs
Response rate100%
17 neighbors recently requested a quote
Avatar for Grove Heating and Cooling Inc
Grove Heating and Cooling Inc
4.7(
153
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+5 more

Serving Pasadena, MD and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"Grove did a great job in presenting all options for our new AC system and potential air cleaning systems (without making any aggressive sales pitches), and then did a great job with installing the new system. The new system has been in place for a few weeks now and is working very well - great job by Grove."
Response time5 hrs
Response rate100%
19 neighbors recently requested a quote
Avatar for GAC Services
GAC Services
4.8(
293
)
Central A/C - InstallCentral A/C - Service or Repair

Serving Pasadena, MD and surrounding areas

Approved (Corporate)

In business since 1970

Free estimates

Warranties offered

"My experience was fine. I went with this company instead of another company because of the reviews I read on Angie's List. It took them about a half a day to install the air conditioning unit. I think it was 3 workers that came out."
Additional Photos
Recommended by94%of homeowners
Avatar for McCrea Heating & Air Conditioning Services of MD
McCrea Heating & Air Conditioning Services of MD
4.5(
318
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+6 more

Serving Pasadena, MD and surrounding areas

Approved

In business since 1936

Free estimates

Emergency services offered

"Checked Angie's List and saw a very good review for McCrea Heating and Air Conditioning, plus a special promotional coupon so gave them a try. Service tech (Mike) made a multi-point inspection. He found and corrected some minor issues and added coolant. Fortunately nothing major was required. He was on time and courteous, and readily answered the questions I peppered him with. A very positive experience."
Additional Photos
Additional Photos
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10 neighbors recently requested a quote
Recommended by87%of homeowners
Avatar for Carroll Mechanical, Inc.
Carroll Mechanical, Inc.
5.0(
20
)
Central A/C - Service or Repair

Serving Pasadena, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2000

Free estimates

Emergency services offered

"My air conditioning stopped working last night. I called Carroll mech . They responded immediately and sent technician to the house few hours later. Jordan Scott was very professional. He checked the system carefully and fix the issue soon. Really appreciate the service!"
Trane Heat Pump
Carrier AC + Furnace
Response time5 hrs
112 neighbors recently requested a quote
Recommended by22%of homeowners
Avatar for Beltway Air Conditioning, Heating & Plumbing
Beltway Air Conditioning, Heating & Plumbing
4.6(
120
)
Central A/C - Service or RepairCentral A/C - InstallCentral A/C - Install - For Business+5 more

Serving Pasadena, MD and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

"Ryan and Mitch came out and spent about 30 minutes checking out the various components of my air handler and heat pump. They scrubbed some rust off of coils and they identified a capacitor that needed to be replaced showing me how the part was showing its wear. They will return in a week to replace it. They were professional and took the time to explain things to me. I will certainly use them again!"
Brazing
XC25
XC25
Our Team!
Response time1 day
54 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for One Hour Heating & Air
One Hour Heating & Air
4.7(
26
)
Central A/C - InstallCentral A/C - Service or Repair

Serving Pasadena, MD and surrounding areas

Approved

In business since 1949

Free estimates

Emergency services offered

"Alan came on time and thoroughly evaluated my home's HVAC and duct system. He agreed that the duct work that I wanted done would likely solve the issue with my system and home. He was much more thorough that he could have been to satisfy my needs. I already had a quote for a much higher amount from Supreme Service Today who has been servicing my home for about three years. Suspecting that Supreme Service Today's quote was very high, I turned to Angi to get competitive bids. Since I had a bid at a much more reasonable price from Alan at One Hour Heating and Air, I contacted Supreme Service Today and asked for a price match. They were willing to match the much lower price from One Hour Heating and Air, so I gave the business to the HVAC contractor that I've been working with for a few years. Good deal! (: Soon I may break my ongoing contract with Supreme Service and come to One Hour Heating and Air !! :)"
Failed Capacitor
New Capacitor
A/C Unit
Inside A/C Unit
Indoor Unit

+17

Response time2 hrs
Response rate93%
8 neighbors recently requested a quote
Avatar for JDL HVAC & Plumbing Services
JDL HVAC & Plumbing Services
4.5(
950
)
Central A/C - Service or RepairCentral Humidifier - Install or ReplaceCentral Humidifier - Repair or Service

Serving Pasadena, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2010

Free estimates

Emergency services offered

"Mr Isak fix my air conditioning Outside unit and performed a system check. During the service check he found the installation booklet inside the unit which could have caused additional problems. Mr Isak was very professional and had a great personality. I would definitely recommend this company to anyone looking for service."
NEW INSTALL
CLEANING COILS
CLEANING COILS
 CLEANING COILS
 CLEANING COILS

+118

Response time5 hrs
242 neighbors recently requested a quote
Recommended by91%of homeowners
Haygood Mechanical, LLC
4.4(
146
)
Central A/C - Service or RepairCentral A/C - Service or Repair - For Business

Serving Pasadena, MD and surrounding areas

Approved

In business since 2001

Credit card accepted

Customers say: Quick response

"Damian came out to replace our humidifier on our heat pump as well as install a new thermostat system - he is very knowledgeable about hvac systems and he is very conscientious in coming to re-check the humidifier when it wasn't initially working as well as replacing a faulty thermostat gateway without additional charge."
Response time4 hrs
Response rate100%
4 neighbors recently requested a quote
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Showing 1-10 of 491

FAQs for air conditioning projects in Pasadena, 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 Pasadena, MD homeowners’ guide to air conditioning services

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