Keeping your home dust free and allergy free is what your furnace filter does. What type you get is really up to you. You can get regular fiberglass filters to the newest technology of plug in filters. Why should you consider a furnace filter?
Keeps dust out of your home
Keeps allergens out of the air
Keeps the coil of the furnace clean
Deciding on what type of furnace filter to buy depends on your furnace manufacturer as well as what type you want. If you are looking for an allergen one then go by the manufacturer’s suggestions. They can tell you the size to get for your model of furnace.