The frequency of changing your furnace filter depends on a few factors such as the type of filter, the air quality in your home, and the manufacturer's recommendations. In general, it is recommended to change your furnace filter every 1 to 3 months. However, if you have pets, allergies, or live in an area with high levels of dust or pollutants, you may need to change it more frequently, perhaps every month.

Regularly changing your furnace filter ensures proper airflow, improves indoor air quality, and helps your furnace run efficiently. It's a good idea to check the filter monthly and replace it when it looks dirty or clogged.