What Causes Low Airflow in Your Air Conditioner Unit

Dirty or Clogged Air Filters

Your AC’s air filters are responsible for removing dust, debris, dander, pollen, allergens, and other pollutants from the air that enters your unit. But over time, air filters will trap so many particles that they will become clogged and significantly restrict your airflow. If you haven’t changed your AC’s air filters over the last 3-4 months, clogged air filters can be the culprit for your AC airflow problem. Air filters need to be replaced every 30-90 days, depending on the type of air filters you use, the AC system you use, pets in your home, and climate.

Low Refrigerant Levels

Low refrigerant levels, which are commonly caused by a system leak, can cause airflow issues and reduce your AC’s efficiency. This is a common issue with older air conditioning units. You’ll know your AC is low on refrigerant if you hear bubbling or hissing sounds from your AC unit and the unit takes much longer than it should to cool your home. You should have a professional HVAC technician inspect your AC unit if you notice these issues.

Dirty Coils

The condenser coil plays an important role in releasing the warm air that’s removed from your home. Since this component is housed in the outdoor condenser unit, it is constantly exposed to the elements. Dust, dirt, grime, and other particles can build up on the condenser coils over time. When the condenser coils are covered with dirt or grime, they won’t be able to release warm air efficiently, thereby interfering with airflow. It’s advisable to have your AC unit’s condenser coils cleaned once or twice every year to prevent airflow issues and the risk of your unit overheating.

Blower Fan Troubles

The blower fan draws air from the return vents and then sends it through the AC system and onto the vents that open into your rooms. If the blower fan malfunctions, perhaps due to a worn-out belt or a faulty capacity, your unit will experience airflow issues. To prevent blower fan troubles, you should schedule regular AC inspection and maintenance.

Aging AC Unit

In old age, it’s common for an AC unit to develop airflow issues and decreased cooling efficiency. AC units typically last 12-15 years, as long as you keep up with proper maintenance. If you’re experiencing airflow issues and your unit is nearing the end of its lifespan, it’s advisable to call in a professional HVAC company to inspect the unit and advise you accordingly.

Other common causes of low airflow in your AC unit include a faulty thermostat, an obstructed vent, an oversized & undersized HVAC unit, and accumulation of debris in the outdoor unit.

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