The Mohonk Mountain House has been a retreat for nature enthusiasts since 1869. It is one of America’s oldest privately owned resorts, Mohonk is a destination of choice for those looking for elegant surroundings and natural beauty. Undergoing numerous renovations over many years, the most recent was the addition of a spa, and air conditioning. Mohonk had never added air conditioning, not even in room unit vents, due to concerns about noise in the pristine mountain resort. As clientele has changed over the years, it became apparent that air conditioning was going to be needed. The engineers on the project contacted AVL about how to achieve a noise neutral solution. The solution had to work not only for the Mohonk property but also for the areas downhill from the resort. This open sight line noise path was the far more challenging aspect. AVL created a site simulation using a variety of noise samples from actual mechanical units. These samples were played over a series of loudspeakers arranged to mimic the directionality, frequency, and sound level for various possible types of chillers and barrier surrounds. On a quiet evening the Mohonk staff walked the surrounding trails and listened to various options. The selected option was implemented in 2009, and has operated with zero complaints from guests, management or the surrounding nature areas located below the mountain.