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Dirty Furnace Filters- One Culprit of Poor Indoor Air Quality

Furnace filters play a crucial role in the performance and efficiency of heating and cooling systems. They are designed to trap airborne particles and pollutants, preventing them from circulating through the HVAC system and into the indoor air. Regularly changing furnace filters can not only improve overall indoor air quality but also enhance the performance of the heating and cooling system.

How can dirty filters affect indoor air quality:

  • Reduced airflow: When furnace filters are clogged with dirt and debris, the HVAC system must work harder to circulate air through the ducts. This can reduce the amount of airflow in the home, causing stale, musty air to linger and potentially contribute to respiratory issues.
  • Increased allergens and pollutants: Dirty furnace filters can trap and accumulate allergens and pollutants, including dust, pollen, pet dander, and mold spores. These particles can be released back into the air when the system is in use, contributing to poor indoor air quality and potentially causing health problems.
  • Bacterial growth: If a furnace filter becomes too dirty, it can become a breeding ground for bacteria, mold, and mildew. This can not only affect indoor air quality but also contribute to a musty or moldy smell in the home.

The recommended time to change furnace filter depends on several factors, including the type of filter, the HVAC system’s usage, and the air quality in the home. Generally, it is recommended to change the furnace filter every three months. However, if you have pets, allergies, 4” filters, or live in an area with high level of pollution, you may need to change the filter more frequently, such as every one to two months. It is also a good idea to check the filter monthly and change it when it appears dirty or clogged. Regularly changing the furnace filter can improve indoor air quality, maintain energy efficiency, and prolong the lifespan of your HVAC system.

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