Your furnace's air filter plays a crucial role in maintaining indoor air quality and ensuring your HVAC system runs efficiently. Over time, dust, dirt, and allergens accumulate in the filter, restricting airflow and forcing your furnace to work harder. This not only decreases energy efficiency but can also lead to overheating and potential damage to the system. A clogged filter can cause poor air circulation, leading to increased allergens and dust in your home, which can negatively impact your health, especially for those with allergies or respiratory conditions.

To keep your furnace operating smoothly, it's essential to change the air filter regularly. The frequency depends on factors such as the type of filter, the number of occupants in the home, and whether you have pets. Generally, it’s recommended to replace standard 1-inch filters every 1 to 3 months, while higher-efficiency filters may last up to 6 months. Homes with pets or people with allergies should consider replacing filters more frequently to maintain optimal air quality and system performance.