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How Often Should You Replace Your Furnace Filter?
It's the cheapest, easiest thing you can do for your HVAC system — and most people forget. Here's a simple schedule to keep your air clean and your system happy.
Maintenance December 3, 2024 3 min read
A clogged filter is one of the most common causes of HVAC problems we see — and it's completely preventable. A dirty filter restricts airflow, strains your blower, and lets dust through into your home.
The general rule
- 1" filters: every 1–3 months
- 4–5" media filters: every 6–12 months
- Homes with pets or allergies: toward the shorter end of each range
Signs it's time
If you can't see the filter material clearly through the dust, it's time. When in doubt, swap it out — filters are inexpensive insurance for an expensive system.
On a Brooks maintenance plan, we handle this (and a full system check) for you twice a year, so you never have to think about it.