While a lot depends on the level of use the HVAC system gets, the filter should be replaced every 3 months. There are circumstances, though, when it is advisable to change the filter even more frequently than that. If you have a large household this usually generates more dust and dirt. Pets in the home produce pet dander and dust. Family members who have allergies or those who like to smoke indoors. These are all situations where it would be beneficial to change a filter more regularly, perhaps even once a month. It is not just dust produced indoors that will affect the need to change the HVAC filter, outdoor elements also make their way into the home which can have an impact on indoor air quality. You may want to think about changing your filter regularly if you live in an area surrounded by construction, agriculture or even if there have been wildfires close by.
If you see damage to the filter or notice it is damp or wet, change it immediately. This could produce a toxic environment such as mold spores entering the air. As we can see, HVAC filters do a lot to promote a clean air quality in the home so, don’t forget to check them and change them regularly.