Your HVAC filter is one of the most important components of your heating and cooling system. A clean filter ensures proper airflow, maintains indoor air quality, and keeps your system running efficiently.
The Basic Rule
For standard 1-inch filters, the general recommendation is to replace them every 30-90 days. However, several factors can affect this timeline.
Factors That Affect Filter Change Frequency
Household Size: Larger households generate more dust and debris. A family of 4-5 should change filters every 30-45 days.
Pets: If you have pets, especially ones that shed, plan to change your filter every 30 days. Pet dander and hair clog filters quickly.
Allergies: Household members with allergies or respiratory conditions benefit from more frequent filter changes, ideally every 20-30 days.
Home Location: Homes in dusty areas or near construction should change filters more frequently.
Filter Types and Lifespan
- Fiberglass filters (1-inch): 30 days
- Pleated filters (1-inch): 60-90 days
- Pleated filters (4-inch): 6-12 months
- HEPA filters: Follow manufacturer guidelines
Signs Your Filter Needs Changing
- Visible dirt and dust accumulation
- Reduced airflow from vents
- Increased dust in your home
- Higher energy bills
- System running longer than usual
The Cost of Neglecting Filter Changes
A dirty filter forces your HVAC system to work harder, increasing energy consumption by 5-15%. It can also lead to frozen evaporator coils, compressor damage, and premature system failure.
Set a reminder on your phone or calendar to check your filter monthly. A few minutes of maintenance can save hundreds in repairs and energy costs.