There is provided an energy recovery device for recovering energy from exhaust air which flows through a discharge line. The energy recovery device includes a heat exchanger device having at least a first heat exchanger unit and a heat pump, wherein the heat pump is connected at the high-temperature side thereof to the first heat exchanger unit and is arranged at the low-temperature side thereof in the exhaust air flow in the exhaust air flow direction downstream of the first heat exchanger unit or is connected at the low-temperature side thereof to a second heat exchanger unit which is connected downstream of the first heat exchanger unit in the exhaust air flow direction.