 That's right. So let's dive into the top five household filters that you should be checking regularly. First, of course, the one you're probably all thinking of right now, and that's your HVAC filter, the one for your heating and air conditioning system. Now, this filter traps dust and pollen and other airborne particles, preventing them from circulating throughout your home. You do need to check it monthly, and you need to replace it as needed to make sure you have proper airflow and good indoor air quality.