View our selection of 1 inch air filters for your furnace and air conditioner.  These are typically the standard air filters that fit into your heating and cooling equipment.  These air filters range from minimum efficiencies required to protect the equipment, to medium efficiencies.  Styles include fiberglass mesh furnace and air conditioner filters, to pleated media style filters.  Change your air filters on a regular schedule to reduce energy use and premature equipment failure.