Avoid noise from heatpump outdoor
Helpful guide for private builders
The Bavarian State Office for the Environment (LfU) has published a guide to dealing with noise problems caused by the installation of air-source heat pumps in private houses. In this connection the authority examined individual components of a heat pump regarding noise. Fans are not the only source of noise, but they are responsible for ninety percent of noise problems. During the preparation of the guide, it also came to light that there are considerable differences in the quality of individual products in terms of noise. After all, if all components of an air-source heat pump are optimized in terms of noise, the sound power level should be no more than 50 dB(A). In fact, however, the sound level of equipment on the market can be 70 dB(A) and above.
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The negative effect of infrasound on human health is controversial in the permitting of industrial installations. The scientific evidence is thin so far. Researchers at the Ludwig-Maximilian-University Munich (LMU) could now prove that the inner ear needs a relatively long time to recover from exposure to low-frequency sound. “The recovery time is longer than the duration of the load,” says researcher Dr. Drexl of the Department of Neurobiology at the LMU. 
