Your AC air filter does two jobs at once. It traps dust and pollen so you breathe cleaner air. It also shields the coils and blower from grime that kills efficiency.
A clogged filter blocks airflow. Your unit works harder, bills rise, and parts wear out fast. Most homes do fine with MERV 8–11 filters. They catch pet hair and most allergens without choking the system. HEPA filters trap smaller particles but need stronger fans to push air through. Match the filter to your unit’s specs or you risk motor strain.
Check your filter monthly. Swap it every 60–90 days in normal use. Homes with pets or allergy sufferers may need changes every 30 days. The small cost of a new filter beats a $500 coil cleaning or early compressor failure.
FAQ: Can I run my AC without a filter? You can, but don’t. Dust coats the coils within days, cuts cooling power, and voids most warranties. It’s a costly shortcut.
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