How to Service an Air Conditioner

Co-authored by Victor Belavus and Eric McClure

Last Updated: November 18, 2024 Approved

The same way your vehicle requires a regular oil change, your AC system requires an annual service call. AC servicing typically refers to the process of getting an HVAC technician out for an annual inspection and maintenance work, but you may be able to save a few dollars if you do all of the cleaning yourself. With that said, you won’t be able to diagnose any deeper problems without the eye of a qualified technician, so you really do need to get a regular checkup to keep things cool around your home.

Question 1 of 8:

How often should you have your air conditioner serviced?

Download Article

A yearly service call will keep a bunch of minor problems from getting out of hand. If you never service your air conditioner, it can start pumping out harmful microorganisms as bacteria and grime build up inside of the components. The system won’t work as well either, which can cause your energy bills to skyrocket. A yearly service will keep these issues in check.^{[1]
X
Research source}

Question 2 of 8:

How much does it cost to service an air conditioner?

Download Article

It can range from $50-140 depending on the system. A simple window unit checkup will probably run closer to $50, while a service call for a large central air system will cost a little bit more. Call around to get quotes from HVAC companies in your area to find the best prices. Just make sure you’re hiring a licensed HVAC technician—your Uncle Joe from down the street won’t cut it here.^{[2]
X
Research source}
- This may sound pricey, but you’ll pay even more over time if you never get your AC system serviced. A dirty or damaged AC unit can lead to some expensive utility bills!

Question 3 of 8:

What is included in AC servicing?

Download Article

A clean fan, case, and coils is essential for healthy, cool air. They’ll clean your AC unit thoroughly to keep debris and bacteria from building up inside of your unit. They may also adjust your fan if it’s a little imbalanced to make sure that your home stays properly and efficiently chilled during the summer months.^{[3]
X
Research source}
2
Service calls will also include refrigerant, airflow, and leak checks. A typical service call will also involve a refrigerant check to make sure that your AC system is adequately filled. They’ll also assess the blower components to make sure the air is blowing out efficiently, and check your unit for any kinds of leaks or corrosion. They should be able to fix those problems for you on the spot.^{[4]
X
Trustworthy Source

U.S. Department of Energy
Official site for the U.S. Department of Energy, which provides resources related to energy safety, conservation, and efficiency

Go to source}
- For electrical issues, a service technician may use a multimeter to test the electrical components in the compressor.^{[5]
  X
  Research source}

Question 4 of 8:

What kind of service can I do on my own?

Download Article

1
Replace the filter every 1-3 months depending on how often it’s running. If your AC system is acting up, replacing the filter may solve the issue. A dirty filter can lead to a variety of problems, and if replacing the filter fixes whatever issue you have, you probably don’t need to call a pro. Even if the AC is running just fine, make sure you replace it regularly to keep it running efficiently.^{[6]
X
Research source}
- In central air systems, the filters are typically located in the return ducts on walls or ceilings. Room and window units usually have a filter behind the grill on the front of the unit. Split systems usually have a reusable filter in a panel on the compressor.^{[7]
  X
  Research source}
2
You can clean the system yourself to save a few dollars if you’d like. Cleaning a central, split, or window AC unit on your own will keep it running efficiently. While a service technician will do this for you on a service call, doing it yourself may save you some money.^{[8]
X
Trustworthy Source

U.S. Department of Energy
Official site for the U.S. Department of Energy, which provides resources related to energy safety, conservation, and efficiency

Go to source}
- You may be able to clean the inside of your AC system depending on how comfortable you are opening your AC unit up, but you won’t be able to spot any serious issues without a service technician.^{[9]
  X
  Trustworthy Source
  
  U.S. Department of Energy
  Official site for the U.S. Department of Energy, which provides resources related to energy safety, conservation, and efficiency
  
  Go to source}
- Any service work involving leaks, electrical problems, fan issues, or blower components will require a pro. These aren’t reasonable DIY tasks.^{[10]
  X
  Trustworthy Source
  
  U.S. Department of Energy
  Official site for the U.S. Department of Energy, which provides resources related to energy safety, conservation, and efficiency
  
  Go to source}

Question 5 of 8:

How do I know if my air conditioner needs to be serviced?

Download Article

You should get a yearly service call regardless of whether your AC system is working correctly or not. However, if your AC is blowing out warm air, leaking refrigerant, or it seems to struggle blowing out air at all, contact an HVAC technician to have them take a look as soon as you can.^{[11]
X
Trustworthy Source

U.S. Department of Energy
Official site for the U.S. Department of Energy, which provides resources related to energy safety, conservation, and efficiency

Go to source}

EXPERT TIP

Victor Belavus
Air Conditioning Specialist
Victor Belavus is an Air Conditioning Specialist and the Owner of 212 HVAC, an air condition repair and installation company based in Brooklyn, New York. In addition to HVAC and air conditioning units, Victor also specializes in furnace repair and air duct cleaning. He has over 10 years of experience working with HVAC systems.

Victor Belavus
Air Conditioning Specialist

Schedule your yearly service in the spring, before you start using it for the year. You should also inspect your air conditioner regularly for signs of mold or debris - if these are present, it's time for a service, even if a full year has not gone passed.
2
Electrical problems also deserve a service call. If the AC system turns on and off when it shouldn’t, or the power cuts out randomly, get a technician to take a look. While you may be tempted to open your AC unit up and start toying with wires, it’s not particularly safe to do this and you may make the problem worse. Just have a pro take a look.^{[12]
X
Trustworthy Source

U.S. Department of Energy
Official site for the U.S. Department of Energy, which provides resources related to energy safety, conservation, and efficiency

Go to source}

Question 6 of 8:

How do I know if my air conditioner is working efficiently?

Download Article

Turn the AC on and check the temperatures and refrigerant lines. Find the refrigerant line on your compressor. This is usually the largest pipe on a central air or split compressor. If there’s a bit of condensation on this pipe when the AC is running, it’s healthy. You can also take a thermometer and set it inside one of your ducts where the air is blowing out. Let the AC run for a while, and cross-reference the thermostat with the thermometer. If the numbers are relatively close, it’s functioning correctly.^{[13]
X
Research source}
- You can either set the thermostat on a vent, or do a more precise check by testing the return and supply ducts near your central air unit.
- For window units, you should be able to tell if it’s working or not just by looking at it. If there isn’t any ice building up on the coils and it’s blowing cold air when you turn it on, it’s working just fine.

Question 7 of 8:

How do I know if my AC compressor is bad?

Download Article

A dying AC compressor can cause a variety of issues. However, there’s no way for you to confirm it without getting a pro to take a look. They’ll be able to test the leads and terminals inside of the compressor with a multimeter to determine if the compressor is actually dying.^{[14]
X
Research source}
2
Try resetting the compressor if it shuts off randomly. If your AC system shuts down randomly and you’re suspecting a compressor problem, flip the circuit breakers, wait 5 minutes, and try flipping them back on to see if that helps. If it doesn’t, follow your AC unit’s instruction manual to find the high-pressure limit switch, which is usually located on the compressor’s access panel. Flip that to see if your problem goes away.^{[15]
X
Trustworthy Source

U.S. Department of Energy
Official site for the U.S. Department of Energy, which provides resources related to energy safety, conservation, and efficiency

Go to source}
- If this doesn’t do the trick, it’s definitely time to call a professional.

Question 8 of 8:

What is the average life of an air conditioner?

Download Article

Window units aren’t the most durable of all time, but you should be able to get at least a decade out of it. If it’s more expensive to repair than it is to buy a new one, just replace it.^{[16]
X
Trustworthy Source

Consumer Reports
Nonprofit organization dedicated to consumer advocacy and product testing

Go to source}
2
Central air systems should last 12-17 years. After 12-17 years have passed, the compressor may need to be replaced, or your system may need to be upgraded. You may be able to prolong a central air system’s lifespan by replacing the filter regularly, though.^{[17]
X
Research source}
3
Ductless split systems usually last 15-20 years. One of the major benefits of a ductless split system is that they tend to last a long time. If you take care of it, a split system should last at least two decades before it needs replacing.^{[18]
X
Research source}

Expert Q&A

Search

Add New Question

Question

How do I know if my evaporator coil needs cleaning?

Victor Belavus
Air Conditioning Specialist
Victor Belavus is an Air Conditioning Specialist and the Owner of 212 HVAC, an air condition repair and installation company based in Brooklyn, New York. In addition to HVAC and air conditioning units, Victor also specializes in furnace repair and air duct cleaning. He has over 10 years of experience working with HVAC systems.

Victor Belavus

Air Conditioning Specialist

Expert Answer

Power off your air conditioner, then remove a few screws from the evaporator compartment and check for debris on the fins and drain pan. Get a bottle of room temperature water and flush the drain by pouring water into the condensate pan to make sure the drain is not clogged.

Thanks! We're glad this was helpful.
Thank you for your feedback.
If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
Yes No

Not Helpful 0 Helpful 1
Question

How do you troubleshoot a condensate pump?

Victor Belavus
Air Conditioning Specialist
Victor Belavus is an Air Conditioning Specialist and the Owner of 212 HVAC, an air condition repair and installation company based in Brooklyn, New York. In addition to HVAC and air conditioning units, Victor also specializes in furnace repair and air duct cleaning. He has over 10 years of experience working with HVAC systems.

Victor Belavus

Air Conditioning Specialist

Expert Answer

Check if your condensate pump is plugged in and operating correctly by pouring water into the collection pan.

Thanks! We're glad this was helpful.
Thank you for your feedback.
If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
Yes No

Not Helpful 1 Helpful 1
Question

How often should I get my air conditioner serviced professionally?

Victor Belavus
Air Conditioning Specialist
Victor Belavus is an Air Conditioning Specialist and the Owner of 212 HVAC, an air condition repair and installation company based in Brooklyn, New York. In addition to HVAC and air conditioning units, Victor also specializes in furnace repair and air duct cleaning. He has over 10 years of experience working with HVAC systems.

Victor Belavus

Air Conditioning Specialist

Expert Answer

It's important to get your air conditioner professionally serviced at least every other year for better efficiency and a longer lifetime.

Thanks! We're glad this was helpful.
Thank you for your feedback.
If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
Yes No

Not Helpful 0 Helpful 1