While the answer to that question depends on a number of different factors, in general, the filters should be replaced every 3 months. But, let’s look at some of those situations where changing the filters even more frequently than that would be a good idea.
In larger households which include pets, you may find that dust and pet dander accumulate quicker, this is one instance where changing the filters more regularly would be beneficial. Another example is in homes where one or more family member suffers with allergies or if there is a smoker in the house. It is not just what goes on indoors that should determine how often the filters should be replaced, the homes surroundings also play a role. For instance, if there is construction going on in the area or if you live in an agricultural zone, this would affect your homes indoor air quality so changing the filters regularly is a good idea. This should also be considered if there have been wildfires in the area.
It should be noted that, if you find filters have become damaged in any way or are wet or damp, it is important to replace them immediately. This could greatly affect your homes indoor air quality by releasing harmful toxins such as mold spores into the air.