How often do you change your air filter in your house?

When using less expensive fiberglass filters, it's a good idea to change your air filter every 30 days. These guidelines assume average use and don't take into account the size and type of filter, so high-end filters can last as long as 6 months.This is a general recommendation that you have to change the air filter at home every 30 days when using cheaper fiberglass filters. Folded filters from the top range can last up to 6 months, but these typical models are medium-use and do not take into account the size and type of filter.