Hummble

With growing demand in heat pumps, the disturbance level of night time environmental noise is becoming more prominent as well. It negatively affects people's sleep quality in residential areas, costing global healthcare systems >$100Bn annually.

We have designed a system that removes the annoying hum of heat pumps.  It is based on an active noise cancelling technology, commonly known from the headphone space, which catches critical frequency components and generates inverted waves on top, cancelling them down by up to 30dB.

This effect reduces the tonality of heat pumping products, which is becoming a well recognized acoustical characteristic of the sound quality they produce. ...