One of the most important things you can do to keep your air conditioner running efficiently is to replace the air filters often. Dirty air filters block normal airflow and reduce a system’s efficiency significantly. In fact, replacing a dirty or clogged filter with a clean one can lower your air conditioner’s energy consumption by approximately 5% to 15%.
Make sure to familiarize yourself with the locations of your filters. Common locations are in walls, ceilings, furnaces, or in the air conditioner itself. For central air conditioners, filters are generally located somewhere along the return duct’s length. Room air conditioners have a filter mounted in the grill that faces into the room.
It is recommended to replace your air conditioning system’s filter or filters every month or two during the cooling season to maximize your air conditioner performance, and to save energy. Filters may need more frequent attention if the air conditioner is in constant use, is subjected to dusty conditions, or you have fur-bearing pets in the house.
Find out more about maintaining your air conditioner at the U.S. Department of Energy website.