It's recommended to inspect and change your AC filters every 30 to 90 days. The specific frequency depends on factors like air quality, pets in the home, and usage. Homes with pets or allergy sufferers might benefit from more frequent changes, every 30 to 60 days. Regularly changing your AC filters ensures optimal air quality and efficiency, reduces energy costs, and prolongs the life of your AC unit by preventing dust and debris buildup that can impede airflow and overwork the system.