According to a different article the COP of this heat pump is between 3-4. However, Thermoaccoustic Heat Pumps have some advantages that you can also find in their press release; because there is no refridgerant, only the air medium which is Helium in this case, you can operate them down at much much lower temperatures without loosing much COP, same in reverse (they claim -15C to 50C). And because there is few moving parts (only the acoustic coupler) they can have an immensely better lifetime than a compressor that needs oiling and maintenance (Equium claims 30 years service life).
They aim for fairly small heat pumps from the looks of it, so this might be something targeted at people renting flats. Something to replace the gas burner for most of the winter.
They aim for fairly small heat pumps from the looks of it, so this might be something targeted at people renting flats. Something to replace the gas burner for most of the winter.