Home Improvement

The cheaper/lower quality the air filter, the less particulates it filters from the air. What dust the filter doesn't catch cycles through the system and can get caught by the AC coil. Filter effectiveness is measured by its MERV rating. The higher the rating, the more particulates it will catch. I use a MERV 13 filter but that's because I'm alergic to the entire planet and it helps reduce airborne allergens. If you go much higher than that your furnace/air handler may struggle to blow air.