Air filters play a significant role in the energy efficiency of refrigeration systems. Dirty or clogged filters can increase system pressure drop, reducing airflow and forcing the compressor to work harder, which increases energy consumption. Clean filters, on the other hand, ensure optimal airflow, reducing pressure drop and energy consumption. In fact, a study by the National Institute of Standards and Technology found that dirty air filters can increase energy consumption by up to 20%. Regular filter replacement is essential to maintain energy efficiency and reduce operating costs.