HVAC Acoustics is the science of controlling sound within the structure of a building. It examines the ways that sound waves are transmitted and absorbed by physical structures such as walls, floors and ceilings, and how this affects interior noise levels. It also takes into account elements like air-flow, air temperature, ventilation systems, and acoustic treatment materials in order to create comfortable acoustic environments for occupants. By understanding and managing the principles of acoustics, architects and engineers can design successful HVAC systems that provide living environments free from excess noise.