Aera uses the airflow in a room to evenly circulate super tiny scent molecules. How large an area will vary depending on ceiling height, whether there are partitions or other impediments to air circulation, and the natural airflow in a room. But in general, placed correctly, one Aera will scent a room with an open floor plan and average ceiling height of 12 feet between 500-1000 sq. ft. One Aera Mini will scent a small space with an open floor plan and average ceiling height of 12 feet between 200-400 sq. ft.