When using fans to cool a room with AC, it's important to position them strategically. Place a fan near the AC unit to help circulate the cool air throughout the room. Point the fan towards the center of the room, directing the airflow in a sweeping motion. Additionally, position other fans strategically to create cross-ventilation. Place one fan near a window or door to draw in fresh air, and another fan in the opposite corner to push out stale air. Experiment with different fan placements to find the most effective cooling setup for your specific room.