Any type of furnace filter can be used, but the most popular furnace filter option is the disposable pleated type that blocks some particles and remains inexpensive. Other furnace filter options include disposable fiberglass, disposable electrostatic, permanent electrostatic and high-efficiency pleated.
The least expensive option is the disposable fiberglass filter, which costs around $2.00 as of 2015. Though it is inexpensive, it only filters out large particles, such as dust and lint. The most expensive option is a high-efficiency pleated filter, which costs about $100. These filters can only be used in certain furnaces, but filter out the smallest particles. These filters are ideal for those with autoimmune disorders or respiratory problems.