In the US, air conditioners are found in more than 75% of all houses. Thus, air conditioners rank among the most widely used pieces of equipment nationwide.

Homeowners who invest a large sum of money in energy-efficient air conditioning do so for good reason. Summertime heat waves may be excruciating. A dependable air conditioner maintains comfort in your home.

Have you ever questioned, though, “Why is my air conditioner not cooling the house?” after turning it on? It can occur suddenly, and often the cause is difficult to identify.

Being aware of some of the most typical AC issues will help you be more prepared for them when they do occur. We list 11 possible causes for your air conditioner not cooling in this in-depth article.

1. The blockage in the filters

Filters that are clogged may be the most frequent source of AC problems. Filters can become clogged by dust, pollen, pet hair, and dirt.

Filters that become blocked start to limit the airflow through your air conditioner. As a result, your inside air is not adequately cooled by the air conditioner. The interior evaporator coil and outdoor condenser unit in your system may also become dysfunctional due to clogged filters.

Cleaning and changing filters on a regular basis is the best defense against clogged filters. We advise switching them out every three months. It could be necessary to change filters more frequently for people who own dogs.

2. There is low or leaking refrigerant.

Refrigerant is a chemical used in air conditioning systems that conducts heat outdoors from inside spaces. Your air conditioning system uses a variety of refrigerants to cool the air, such as Puron and the well-known, phased-out Freon. Your air conditioner can have trouble chilling the air in your house if the refrigerant level is low.

The low refrigerant level in your air conditioner may be caused by one of two factors. It’s possible that during installation, the system was not fully charged.

A more frequent possibility is that the system contains a leak. It’s critical that you get professional AC repair as soon as possible in such a situation. Although rare, a refrigerant leak can affect the ecosystem and result in refrigerant poisoning.

3. The Coils Are Grimy or Freezing

Although the evaporator coil is effectively kept clean by the filters in your air conditioner, the coil may eventually develop issues. Incidentally, the accumulation of muck in the indoor evaporator coil can be minimized by installing a UV lamp. It also makes the air better.

Coils are prone to becoming unclean over time due to their humidity and the ease with which mildew and mold can grow there. This may negatively impact how they operate. Additionally, coils may freeze over and cease to function, especially if the system isn’t running with enough refrigerant.

4. Air Is Seeping Out

Have there recently been pests in your attic? Many homeowners discover that their attic has become home to squirrels, rats, and other animals, causing damage to the ductwork.

Inadequate ductwork installation that deteriorates over time might also result in damage.

We also hear about incidents involving attic duct damage caused by plumbers, cable providers, and other home repair specialists.

These are the most frequent causes of air leaks that result in overheating homes. The conditioned air in your house is distributed throughout it by air ducts. Leaks will cause your home’s cooling to decrease.

5. There is no compressor operating.

The core of the entire AC system is the compressor. Refrigerant is moved between the interior and outdoor units via the compressor. Your indoor air cannot be adequately cooled by the system as a whole if the compressor is damaged.

It’s possible that other, more affordable, and smaller electrical components have failed, giving the appearance of a compressor failure. To keep the compressor running, for instance, you might need to replace the capacitor or another hard-start component.

If your system contains a ceiling saver device (also known as a float switch), it will also shut off your compressor in the event that the condensate drain becomes clogged. This keeps your house from leaking water.

Replacing the AC compressor is the best solution for issues with it. The primary issue is that compressors can be very costly. You might want to replace the entire outdoor equipment if this component does not have a warranty.

6. The cause may be issues with the external fan motor.

The exterior fan in the condenser unit of your air conditioner is in charge of removing hot air from your house and releasing it outdoors.

Regrettably, issues with the fan could lead to the compressor in your air conditioner overheating. Hiring a professional troubleshooter with experience in AC repair is the best way to tackle this issue. Your air conditioner will overheat and shut off in a matter of minutes if your fan motor fails. In the meantime, your fan will not operate.

7. The thermostat isn’t working correctly.

The thermostat on your central air conditioning system detects the temperature of the air inside your home and modifies it to your liking. The general operation of your air conditioner may suffer if there is an issue with your thermostat. Thermostats malfunction occasionally, but replacing them is a simple fix.

Sometimes, the settings on your thermostat could be the problem. As an illustration, confirm that your thermostat is set to cool rather than hot.

If new batteries are needed for your thermostat, get them. A hard restart may be beneficial for certain of the more recent smart thermostats. That is, unplug the thermostat from the power supply and plug it back in so that it can restart. This can be an easy remedy if your thermostat seems frozen when you touch it.

8. The registers are blocked or dirty.

Like the filters, the registers in your air conditioner can become unclean over time. This is particularly true if you neglect to routinely wipe the registers.

They can occasionally become blocked, which is terrible for airflow. Sometimes homeowners willfully block them since they aren’t utilizing a certain room or accidentally position furniture in front of them.

Filthy or obstructed registers make your air conditioner work significantly harder, which raises your energy costs without providing enough cooling for your home.

Even though this is one of the most frequent AC problems, fixing it is not too difficult. Just take out the AC registers and vacuum them thoroughly to get rid of any debris, or run them through the dishwasher. Additionally, open any closed registers that may have been blocked.

9. Watch out for overheating from close appliances.

You’ve undoubtedly noticed how hot your home’s electrical gadgets, including your TV, laptop, and lamps, can get.

Appliances that emit heat can interfere with your thermostat’s operation if they are positioned too close to it, as your thermostat is responsible for controlling the temperature in your living area.

Make sure there is always adequate space between electrical gadgets that emit excessive heat and the thermostat.

10. The sun is creating too much heat.

You bought an air conditioning system primarily to protect yourself from the sun’s heat. On the other hand, additional heat from the sun beaming on your AC thermostat may cause the system to overheat and lead to issues.

To lessen the heat load in your home on exceptionally hot days, keep your blinds drawn.

11. You Did Not Perform Adequate Maintenance

Poor maintenance is a common cause of an air conditioner’s inability to provide cool air.

Yes, you could clean the various components of your air conditioner. Still, you’ll need to choose the best HVAC provider to perform a comprehensive inspection of the system. We advise having your AC serviced twice a year, in the spring and the fall.

An AC expert checks the areas of your AC that are difficult for you to reach during this tune-up. The expert can identify any potential problems and fix them before more expensive repairs are necessary.