The frequency to change an air filter generally depends on the type of filter, usage, and environmental factors. Most recommendations suggest changing air filters every 3 months for standard conditions to ensure optimal performance and air quality. However, this interval varies:
- Basic fiberglass filters should be replaced about every 30 days.
- Pleated polyester filters can last from 3 months up to a year depending on thickness and quality.
- Washable filters can be cleaned and reused instead of replaced.
- Homes with pets, smokers, allergies, or higher pollution may need filter changes every 1 to 2 months.
- Less frequently used systems or vacation homes can change filters every 9 to 12 months.
Regular filter replacement improves HVAC system efficiency, comfort, and lifespan. Inspect filters monthly to determine if earlier replacement is needed based on visible dirt or airflow reduction.
