An air conditioner is designed to keep your home cool and comfortable during the hot months. However, like any mechanical system, it can experience issues, one of the most concerning being overheating. An overheating air conditioner can shut down unexpectedly, suffer serious damage, and even pose safety risks. Hal Mechanical would like to share the common causes of an air conditioner overheating, while helping homeowners identify potential issues before they become major problems.

Causes of Air Conditioner Overheating

Dirty Air Filters – One of the simplest yet most overlooked reasons for an air conditioner to overheat is a dirty air filter. When the filter is clogged with dust, pet dander, and other debris, it restricts airflow to the system’s air handler. Reduced airflow makes the air conditioner work harder, which can lead to overheating. Be sure to check and replace your air filters regularly, typically every 30-90 days, depending on usage and the type of filter.
Blocked or Dirty Condenser Coils – The condenser coils, located in the outdoor unit, release the heat removed from your home. If these coils are covered in dirt, leaves, or debris, or if they are bent and damaged, they can’t release heat effectively. This inefficient heat exchange can cause the system to overheat. Schedule a professional cleaning annually to maintain optimal function.
Low Refrigerant Levels – Refrigerant is the fluid that your air conditioner uses to remove heat and humidity from the air inside your home. If there is a leak and the levels of refrigerant drop too low, the system must work harder to cool the air, potentially causing the compressor and other components to overheat. If you suspect a refrigerant leak, contact a professional technician to repair the leak and recharge the system.
Faulty AC Fans – Both the indoor blower fan and the outdoor fan play critical roles in the proper operation of your air conditioning system. If either fan is malfunctioning, damaged, or obstructed, it can lead to poor airflow and overheating. Inspect fans for signs of damage or obstruction and clean them as necessary. If a fan is not working correctly, it may need to be repaired or replaced by a professional.
Improper Sizing of AC Unit – An air conditioner that is too small for the area it is supposed to cool will run continuously, trying to reach the set temperature. This constant running can cause the system to overheat. Ensure that your air conditioning system is appropriately sized for your space. If upgrades or extensions to the home have been made since the air conditioner unit was installed, reassess its suitability.
AC Electrical Issues – Electrical problems, such as faulty wiring, worn out capacitors, or a malfunctioning thermostat, can cause components of the air conditioner to run improperly or continuously, leading to overheating. Have a professional technician inspect and repair any electrical issues. Regular maintenance checks can help identify and resolve these problems early.

Central Air Conditioner Inspection, Tune Up, Repair, Replacement & More in Aliante, Anthem, Desert Shores, Eldorado, Enterprise, Green Valley Ranch, Henderson, Inspirada, Mountain’s Edge, North LV, Peccole Ranch, Paradise, Providence, Rhodes Ranch, Seven Hills, Silverado Ranch, Spring Valley, Summerlin, Sunrise Manor, The Lakes, Tuscany Village & Las Vegas Nevada

Recognizing the common causes of an air conditioner overheating is essential for maintaining your system’s efficiency and extending its lifespan. Most overheating issues can be prevented with regular maintenance and timely repairs. Keeping components clean, ensuring proper refrigerant levels, and verifying that all electrical components are in good working order can help prevent your air conditioning system from overheating. If you notice any signs that your air conditioner is working harder than it should, contact Hal Mechanical.