Enhanced cooling by applying the radiative sky cooler to both ends of the thermoelectric cooler

•The radiative sky cooler (RSC) is placed on both ends of a thermoelectric cooler.•The cold side RSC further adds to cooling and the hot side RSC removes waste heat.•Increasing cold side RSC surface area increased the maximum cooling capacity.•Increasing hot side RSC surface area did the opposite but the cooling power rose.•A minimum hot side RSC surface area exists to ensure sufficient heat removal.