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How Often Should You Replace Your Furnace Filter?
A clean filter protects your blower, keeps air flowing, and helps your furnace run efficiently. Here is a practical schedule for Vancouver-area homes.
Your furnace filter is the first line of defense against dust, pet hair, and debris. When it clogs, airflow drops, the system works harder, and you risk overheating or frozen coils on paired heat-pump setups.
General rule of thumb
- 1 inch disposable filters: check monthly; replace every 30–60 days with pets or carpet.
- Thicker pleated filters (4–5"): often 6–12 months, but still verify monthly.
- High-MERV filters: capture more particles but restrict airflow more — follow the manufacturer max and your technician’s guidance.
Pacific Northwest considerations
Wet winters mean more indoor time and tighter homes. If you run the fan continuously or have allergies, shorten the replacement interval.
Quick test
Hold the filter up to a bright light. If you cannot see light through the pleats, it is time to swap it.
Not sure which filter fits your system? Our techs note the correct size during maintenance visits so you always have the right match.