central air conditioner

Top 6 Most Common Central Air Conditioner Problems of 2023

As the summer approaches, homeowners and businesses across the country prepare for the hot and humid weather by cranking up their central air conditioning systems. However, even the most well-maintained central air conditioners can develop problems that affect their performance and efficiency, leading to discomfort, higher energy bills, and potentially costly repairs.

In this article, we’ll explore the top six most common central air conditioner problems. Whether you’re a seasoned HVAC technician or a novice homeowner, this guide will help keep your air conditioning system running smoothly and coolly throughout the summer and beyond.

Dirty or Clogged Air Filters

Air filters are critical components of central air conditioning systems, as they prevent dust, pollen, and other contaminants from entering the indoor air supply. However, if they become dirty or clogged, they can restrict airflow, reduce cooling capacity, and increase energy consumption. Therefore, regular cleaning or replacing air filters is essential, depending on the manufacturer’s recommendations and usage level.

Low Refrigerant Levels

Refrigerant is the substance that circulates through the air conditioning system, absorbing heat from the indoor air and releasing it outside. If the refrigerant level is low due to leaks or improper installation, the system may not cool properly or consume more energy than necessary. Moreover, refrigerant leaks can be hazardous to the environment and require prompt attention from a qualified technician.

Malfunctioning Thermostat

The thermostat is the device that controls the temperature settings of the air conditioning system, turning it on or off depending on the indoor temperature. If the thermostat is malfunctioning, it may not respond to the user’s commands, causing the central air system to run continuously or not at all. Additionally, some thermostats may require calibration or replacement, depending on their age and condition.

Faulty Capacitors

Capacitors are electrical components that store energy and release it to start the air conditioning compressor and fan motors. If capacitors fail, the system may not start or experience frequent shutdowns, reducing the lifespan and increasing repair costs. Therefore, inspecting and replacing capacitors periodically is crucial, especially if the system is over ten years old.

Frozen Evaporator Coils

Evaporator coils are the parts of the central air conditioning system that absorb heat from the indoor air and transfer it to the refrigerant. However, if the coils become dirty or the airflow is restricted, they can freeze, causing the system to shut down and preventing proper cooling. To avoid frozen coils, clean them regularly and ensure proper airflow through the ducts and vents.

Blocked Condensate Drain

The condensate drain is part of the air conditioning system that removes moisture from the indoor air and directs it outside. However, if the drain becomes blocked by dirt, debris, or algae, it can cause water to back up and damage the central air system or the building. Therefore, it’s crucial to flush the drain line periodically and install a backup system, such as a float switch or a condensate pump.


Central air conditioning systems can develop various problems that affect their performance and efficiency, such as dirty air filters, low refrigerant levels, malfunctioning thermostats, faulty capacitors, frozen evaporator coils, and blocked condensate drains. To prevent or fix these issues, it’s essential to perform regular maintenance, such as cleaning, inspecting, and replacing components of the central air system and consulting with qualified technicians when necessary. By doing so, you can ensure your air conditioning system’s optimal performance, comfort, and safety in 2023 and beyond.

For superior air conditioner repair in Birmingham, AL, call AutumnAir. We offer quality services for your comfort at a reasonable price. Check out our customized care plans and contact us now!

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