Cascade thermoelectric heat pump with vapor compression heat pump

The proposed technology is a residential/ small commercial heat pump (~3-5 tons capacity) that cascades a thermoelectric (TE) heat pump with a conventional air-source heat pump. This heat pump will (a) Boost capacity and COP at colder outside air temperatures, (b) Reduce peak demand by eliminating electric resistance (strip heat) or backup heating and (c) improve efficiency by ~10%.