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Air Conditioner Not Cooling? One of These Things Might Be to Blame

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We rely on our air conditioners a lot in the summertime in St. Louis, and it can be frustrating when they aren’t doing their jobs. If your air conditioner is not cooling properly, there could be a number of things to blame. But don’t sweat, Jerry Kelly is here to shed some light on some of the most common reasons air conditioners act up during the cooling season.

Common reasons for your air conditioner not cooling

Below are some common reasons that an air conditioner might not be cooling properly in your home. Keep in mind that if the problem isn’t listed here, there might be damage to some part of your cooling system, in which case you’ll want to call a professional contractor.

  • No power. If your air conditioner doesn’t seem to be turning on at all, the first thing you’ll want to check is whether or not power is reaching the unit. You might have a blown fuse or a tripped circuit that is preventing it from working.
  • Thermostat set too high. One common reason for an air conditioner not cooling is that your thermostat is simply set too high. Your unit won’t kick on until the temperature in your home breaches the temperature your thermostat is set at, so try lowering it by 5 degrees or so and see if it starts up.
  • Dirty evaporator or condenser coils. If your air conditioner is turning on but you’re not receiving an adequate amount of cool air, you might have dirty evaporator or condenser coils. Evaporator and condenser coil cleaning is a part of air conditioner preventive maintenance, so you can avoid this problem by having your unit tuned-up every year.
  • Condenser blocked. If there is foliage or debris around your outdoor condenser, it might be preventing the unit from working properly. Check outside to see if there is anything blocking the condenser and make sure to trim any foliage back at least 2 feet.
  • Dirty air filter. A dirty air filter can reduce your air conditioner’s air flow and damage your unit, preventing it from properly cooling your home. Make sure to check and change your filter once a month.
  • Incorrectly sized unit. It’s crucial to have an air conditioner that’s properly sized for your home. If your unit is too large or too small, it will often short cycle and won’t be able to cool your home when it gets too warm out.

If you have any questions about your air conditioner not cooling, or if you’d like a cooling system serviced or installed in your home, contact Jerry Kelly, your St. Louis area heating and cooling company.

Photo credit: Miki

Why is my air conditioner running but not cooling the house near Saint Peters?

If your air conditioner is constantly running but your house is not cooling down, there could be a number of reasons why. Some common reasons include:

  • Thermostat in switched to ON instead of AUTO - Switch the thermostat to AUTO so that air will only blow into your house when the AC is running.
  • Dirty air filter - A dirty air filter hinders airflow to the AC unit. Replace the filter to allow air to flow easier.
  • Dirty outdoor condenser - If your outdoor unit is covered in dirt or debris, it won’t be able to properly dispense the heat from your house. Remove any dirt or debris gently to not damage the condenser. 
  • Tripped circuit breaker - Air conditioners typically have an indoor and an outdoor circuit breaker. Make sure your outdoor breaker is not tripped. If you reset it and it trips again, you will need to contact a professional to determine what is wrong. 
  • Refrigerant leak - Refrigerant absorbs the heat from your home’s air. If there is a leak of refrigerant you will need to have a professional inspect and repair.
  • Ductwork leak - The system of ducts in your home transports warm and cool air to and from your unit. If there are leaks in the ducts, that air will flow out. 
  • Faulty compressor - The compressor is the part in the AC that takes the refrigerant and circulates it to remove heat from the home. If the compressor isn’t working, then your home will not cool. 

For more information on air conditioner troubleshooting, contact Jerry Kelly Heating and Air Conditioning. We pride ourselves on being the premier heating and air company in the Saint Peters area. Call us 24 hours a day, 7 days a week at (636) 757-8506.

Why is my central air not working near Saint Peters?

Some signs your central air might not be working properly are:

  • Not blowing hot or cold air - Sounds like a no-brainer, but if your HVAC unit is not heating or cooling your house, then something is wrong. 
  • Unusual sounds - Air conditioners run pretty quietly if they are running well. Any banging, clanking or grinding sounds could indicate a loose belt or metal components that need to be lubricated. 
  • Strange smells - If you detect a strange smell coming from your unit, it could be mold, mildew or a burning wire. 
  • Pooling water - Any pools of water around the unit or condensation on the air vents most likely indicates something is wrong with your AC. 
  • No airflow - When a unit is running but no air is coming out, it could be a number of problems, including blocked ducts or a faulty compressor.

If you have questions about your central air, call Jerry Kelly at (636) 757-8506 or contact us online. We’ve been providing quality service to the Saint Peters area for over 40 years.

What do I do if my air conditioner isn't blowing cold air near Saint Peters?

When an air conditioner is not blowing cold air, there are a few things you can do at home before you want to call in professional help in Saint Peters.

  • Switch the thermostat to AUTO instead of ON so that air will only blow into your house when the AC is running.
  • Replace air filters to allow air to flow easier.

If the unit is still blowing hot air, you will most likely need the services of a professional technician. Some common problems a technician would need to fix include:

  • Low refrigerant because of a leak
  • Dirty evaporator coils
  • Ductwork leaks

For more information on air conditioner troubleshooting, contact Jerry Kelly Heating and Air Conditioning or call (636) 757-8506.

Why is my home air conditioner running but not cooling?

Your home air conditioner may be running but not cooling because: 

  • Your condenser is broken or clogged.
  • Your AC unit has a refrigerant leak.
  • Your AC unit’s evaporator coil is dirty or frozen. 

If you notice that your air conditioner is running but not cooling, you should shut it off and have it repaired right away. To find out more about getting your home air conditioner repaired, contact us today.

Why is my home air conditioning system not cooling enough?

Your home air conditioning system may not be cooling enough because: 

  • Your AC unit’s air filter is clogged.
  • Your AC unit’s thermostat is malfunctioning.
  • Your AC unit is not sized correctly for your home. 

If you address each of these issues, but your home air conditioning system is still not working, you should have an experienced HVAC technician repair your AC unit for you. To get your AC unit repaired, call us today.

What can I check if my residential AC unit is not cooling?

If your residential AC unit is not cooling, you can check the following: 

  • Your AC unit’s thermostat. 
  • Your AC unit’s air filter. 
  • Your AC unit’s outside unit.

If you check each of these things and they all seem to be working properly, you may need to have your AC unit inspected and repaired by an HVAC technician. To get your AC unit repaired, give us a call today


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The Most Important Part of Our Company is Our Customers
Kimberly G.
01:51 22 May 22
I had my ac tuneup for the Dpring. Aaron was very professional and thorough. He did great work.
K M.
20:14 21 May 22
Erik was very helpful in explaining what was wrong with my A/C unit. Was thorough and efficient, very knowledgeable.
bryan D.
18:23 21 May 22
Mike C came out and fixed our ac in a timely and professional manner. Very happy with the service he performed.

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