A healthy living space is only worth living in when you can find quiet there. Therefore, one of the 25 Principles of Building Biology states: “Protective measures against noise and vibration pollution need to be based on human needs.” The psychological component of noise is frequently underestimated: How noise is perceived depends to a great extent on a person’s current disposition, but more so even on whether a person associates something positive or negative with the source of noise (e.g. beautiful or ugly music, nice or unsympathetic neighbors, ocean surf or car noise). In addition to sound audible to human ears, there is also inaudible infrasound, which frequently is perceived as vibration. Our knowledge about infrasound is rather slim, but affected people can frequently be driven to despair. Therefore, high-quality sound insulation in the construction of buildings is essential to a healthy living environment.