It is generally recommended to change the air filter in your AC system every 1 to 3 months. However, the frequency can vary depending on factors such as the type of filter, the level of usage, the indoor air quality, and the presence of pets or allergies. Regularly changing the air filter is important as it helps maintain proper airflow, improves indoor air quality, and ensures the efficient operation of your AC system.  Clogged or dirty filters can restrict airflow, reduce cooling efficiency, and lead to increased energy consumption. By replacing the air filter at regular intervals, you can optimize the performance of your AC system and promote cleaner and healthier air in your home.