The frequency of changing an air filter depends on the type of filter and its application:
- For a vehicle engine air filter, it is generally recommended to change it every 12,000 to 15,000 miles or about once a year, whichever comes first. However, if driving conditions are dusty or sandy, the air filter may need to be changed more frequently to prevent engine performance issues.
- For home air conditioning (AC) filters, the recommendation varies by filter type: standard 1 to 3-inch filters should be changed every 30 to 60 days if there are no allergy concerns. Pleated filters may last around 90 days, but changing every 45 days is recommended for maximum efficiency. Media filters can last 6 to 8 months. If allergies or pets are factors, more frequent changes are advised.
In summary:
- Vehicle engine air filter: Every 12,000-15,000 miles or once a year, more often in dusty conditions.
- Home AC air filter: Every 30-90 days generally, depending on filter type and environment, with more frequent changes if allergies or pets are present.
Regular inspection and replacing when visibly dirty or clogged are good practices to maintain performance and air quality.
