Air Filter Replacement Calculator
Calculate when to replace your HVAC air filter and estimate annual filter costs based on home size and filter type.
Replace Every
77 days
Replace Every vs Rated Filter Life
公式
## HVAC Air Filter Replacement Air filters trap dust, pollen, and pet dander. Replacing them on time maintains air quality and HVAC efficiency. ### Adjusted Replacement Interval **Adjusted Life = Rated Life x (1 - Pet Factor - Allergy Factor)** Each pet reduces filter life by about 15%, and allergy concerns warrant replacing 20% sooner. A clogged filter reduces airflow, increases energy costs by 5-15%, and can damage the HVAC system.
计算示例
A 90-day rated filter in a home with 1 pet and no allergies, costing $15 each.
- 01Adjusted life = 90 x (1 - 0.15 - 0) = 90 x 0.85 = 76.5 days
- 02Rounded = 77 days
- 03Filters per year = ceil(365 / 76.5) = 5 filters
- 04Annual cost = 5 x $15 = $75
常见问题
What MERV rating should I use?
MERV 8 is sufficient for most homes. MERV 11-13 captures smaller particles for allergy relief. Above MERV 13 may restrict airflow in standard HVAC systems.
What happens if I forget to change the filter?
A clogged filter restricts airflow, making your system work harder. This increases energy bills, reduces heating/cooling capacity, and can cause system overheating or freezing.
Do expensive filters last longer?
Pleated filters (MERV 8-13) last 60-90 days. High-end electrostatic filters last 90+ days. Cheap fiberglass filters last only 30 days and catch less. Cost per day of quality filtration often favors mid-range filters.
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