Maintenance
How Often Should You Change Your HVAC Filter? The Real Answer
5 min read••
The answer isn't always what's printed on the box. Your filter change frequency depends on several factors specific to your home.
"Change every 30-90 days" says the package. But that generic advice doesn't account for your specific situation.
Factors That Affect Filter Life
Your Filter Type - 1" fiberglass filters: 30 days - 1" pleated filters: 30-90 days - 2" pleated filters: 3-4 months - 4-5" media filters: 6-12 months
Your Household - Pets: Add pets, change more often. Multiple pets or heavy shedders might need monthly changes. - Allergies: If anyone has allergies, more frequent changes help. - Occupancy: Rarely home? Filters last longer. Large family home all day? Change more often.
Your Home - Older homes: Often dustier, need more frequent changes - Near construction: Dust means faster filter clogging - High pollution area: Filters work harder
System Usage - Run 24/7: Filters clog faster - Mild climate, occasional use: Filters last longer
The Real Test
The best way to know? Check it. Pull the filter out monthly and look at it. If you can't see light through it, it's time to change.
Why It Matters
A dirty filter: - Reduces airflow and system efficiency - Increases energy costs - Can cause the system to freeze or overheat - Shortens equipment lifespan - Decreases indoor air quality
A $20 filter replaced regularly can prevent $500+ repairs.