[tootie]

It can operate efficiently at lower temps. Current air source heat pumps see degraded performance and below freezing temps and will not be able to effectively heat a home at the lowest temps that can occur in the northern hemisphere.

[mrfusion]

Thanks. But I’m trying to figure out how they do that.

[margalabargala]

The "secret sauce" of the increased efficiency is that they're using thermoacoustics, which previously had been a technology used in one-off applications with a large budget (e.g. the James Webb telescope uses it to stay cool). Prior to now there were no manufacturers providing the technology to be widely available at scale.