The answer to 'how long does air filter last' is that most HVAC air filters need to be replaced every 1-3 months, depending on factors like home size, number of occupants, and pet ownership. Properly maintaining your air filter is important for indoor air quality and the efficiency of your HVAC system.
Air filters should be checked monthly and replaced when they become dirty or clogged. Factors that can impact filter lifespan include the type of filter, amount of use, and presence of airborne contaminants in your home. Pleated filters tend to last longer than flat filters, while homes with pets or high occupancy may require more frequent replacements.