Any thoughts on this thermal-acousit heatpump

Saw this blurb for a new type of heat pump from Blue Hearth Energy. (See https://www.pv-magazine.com/2022/06/29/thermo-acoustic-heat-pump-for-residential-applications/ for more.) Curious if anyone is familiar with this technology. Saw this blurb for a new type of heat pump from Blue Hearth Energy. (See https://www.pv-magazine.com/2022/06/29/thermo-acoustic-heat-pump-for-residential-applications/ for more.) Curious if anyone is familiar with this technology.Read MoreGreenBuildingAdvisor