Air Filter Replacement Schedule Calculator
Find out how often to replace your HVAC air filter based on filter type, pets, allergies, and household conditions.
Replacement Schedule
Air filter replacement frequency depends on filter type, household conditions, and air quality needs.
Base replacement intervals by filter type:
- 1" fiberglass (MERV 1-4): 30 days
- 1" pleated (MERV 5-8): 60-90 days
- 2" pleated (MERV 8-11): 90-120 days
- 4" pleated (MERV 11-13): 6-9 months
- 5" pleated (MERV 13-16): 9-12 months
Factors that shorten filter life:
- Pets: Each pet reduces life by ~25-30%
- Allergies/Asthma: Replace 25% more often
- Dusty area/construction: Replace 30% more often
- Running HVAC constantly: Replace 20% more often
- Smoking in home: Replace 30% more often
Signs your filter needs changing:
- Visibly gray or clogged
- Reduced airflow from vents
- Higher energy bills
- More dust on surfaces