How do AC ducts work?
AC units cool the air by passing indoor ac airstream over refrigerated coils that conduct heat inside ac units. The heat is expelled outside through cooling coils or ventilation louvers located on the back exterior section of each ac vent. The cooled air travels through metal ac ductwork to outlets throughout the house before it enters rooms at floor level or near floor level via diffusers attached directly to ac vents or indirectly by way ac unit returns.