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In general, an HVAC filter should be replaced every 90 days. However, depending on the quality of your filter and the environment of your home, you may need to change it more or less often. It’s best to use the recommendation from your manufacturer as a general guideline. You can also occasionally check the condition of your filter (every month or so) to determine if it needs to be replaced.

A portable air filter system can generally last between five and ten years, provided it undergoes regular maintenance and cleaning. In some cases, the unit could last much longer. Whole-house air filtration systems that integrate with the home's ductwork can last for the lifetime of the existing HVAC system with proper maintenance.

A correctly installed air filter will fit snugly in its compartment. One that’s too thick or big won’t lie smoothly, and it can block the airflow, sometimes resulting in strange noises. A filter that’s too small or improperly fitted may move around in the compartment, resulting in strange humming or vibration noises. Poor fitting can eventually cause a buildup of dirt in the HVAC ductwork, and reduced indoor air quality can lead to sneezing or excess dust on your surfaces.

Both an air purifier and a dehumidifier can help prevent future mold growth, but neither can remove existing mold. An air purifier will improve air quality and trap mold spores in the air, whereas a dehumidifier will reduce moisture in the environment. Keep in mind that you need to make sure your air purifier uses HEPA filters, which are rated for mold removal.