"All furnaces are equipped with an air filtration system designed to trap dirt, dust and other pollutants. Maintaining a clean furnace filter not only helps keep your furnace's interior components clean and in good operating order, but also contributes to improved air quality by reducing the amount of allergens and harmful particles in the air.

While service technicians may replace your furnace filter during an annual inspection, these filters are working constantly to keep airborne pollutants out of the air you breathe and away from the operating parts of your furnace. With everyday debris constantly piling on, changing or cleaning your furnace filter frequently is essential to maintaining the unit's optimal operating efficiency -- and thereby keeping your monthly bill low. But how do you replace your filter? And how often is often enough?"

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