IANA thermodynamicist, but I suspect the resulting system could not be more efficient than either the heat pump or the pyroelectric charge pump by itself. So if

IANA thermodynamicist, but I suspect the resulting system could not be more efficient than either the heat pump or the pyroelectric charge pump by itself. So if this conversion process is really that great, you would end up replacing your heat pump with it instead of combining them. I think this only applies if we're constraining the temperatures to typical summer outdoor/indoor cooling applications. Different technologies are going to have different temperature ranges at which they are most efficient, so for something like steam power generation multi-stage systems are common.