"Every 90 days" is the answer most people have heard — and it's a reasonable starting point, but it's not the whole story. The right filter-change schedule depends on a few things specific to your home.
What actually affects your filter schedule
- Filter type. A basic 1-inch fiberglass filter clogs faster than a higher-MERV pleated filter, but a higher-MERV filter can also restrict airflow if your system isn't designed for it.
- Pets. Homes with shedding pets typically need filter changes every 60 days or sooner.
- Household size. More people generally means more dust and debris circulating through the system.
- Renovation or construction nearby. Drywall dust and debris can clog a filter in a matter of days.
Why it matters beyond air quality
A clogged filter doesn't just reduce air quality — it restricts airflow, which makes your system work harder to move the same amount of air. Over time, that extra strain can contribute to higher energy bills and added wear on components like the blower motor.
A simple way to stay on track
Check your filter monthly, at least for the first few months in a new home, so you can see how quickly it actually gets dirty for your specific situation. From there, you'll have a real answer instead of a generic rule.
If you're enrolled in The AC Club, filter and system checks are part of your seasonal maintenance visits, so this is one less thing to track yourself.