When should I change my car's HEPA filter?

Robin's Question: "How often do you have to change your HEPA filter on cars that drive in Arizona?"

I have to first congratulate you on even knowing that your car has a HEPA filter… most people don't even know what one is! HEPA stands for High Efficiency Particulate Air filter, and they are used in many modern cars in the climate control's intake system to filter out dust, pollen, and pollutants, which can enter the passenger compartment. Some manufacturers don't even list a replacement interval for them in the owners manual. My recommendation would be to replace yours every 12 months under normal driving conditions in Arizona. More often if you drive dirt roads. If you notice a reduced volume of airflow coming from your cars air conditioner, a plugged up HEPA filter is the most likely cause. Have your mechanic check and replace it as needed.