The frequency of changing the cabin air filter in a car depends on various factors such as the make and model of the vehicle, driving conditions, and climate. However, it is generally recommended to replace the cabin air filter every 12,000 to 15,000 miles or once a year, whichever comes first. In areas with high levels of air pollution, dusty roads, or construction sites, the cabin air filter may get clogged faster and require more frequent replacement. Similarly, in areas with high humidity or heavy rainfall, the filter may become damp and promote the growth of mold and bacteria. This can cause unpleasant odors and affect the air quality inside the car. It is important to note that a dirty or clogged cabin air filter can reduce the efficiency of the car’s ventilation system, reduce airflow to the cabin, and increase strain on the blower motor. This can lead to reduced heating or cooling performance, increased fuel consumption, and even damage to the HVAC system over time. To ensure that your car’s cabin air filter is working properly and to maintain good air quality inside the cabin, it is a good practice to check the filter periodically and replace it as needed. You can consult your car’s owner’s manual or a certified mechanic for specific recommendations on how often to replace the cabin air filter in your vehicle.