Heat-pump installation which is configured for simultaneous heating and cooling, having a heat source and having a heat sink and also having - a first heat pump , which is in the form of a liquid-liquid heat pump and is connected on a source side to the heat source and on a sink side to the heat sink, wherein - the heat source comprises a cooling circuit having a cooling feed , a cooling return , a cooling buffer store for cold water, and, in the connected state, a cooling consumer , - the heat sink comprises a heating circuit having a heating feed , a heating return , a heating buffer store for heating water, and a heating consumer , wherein the heating circuit has, as an alternative or in addition to the heating buffer store and the heating consumer , a hot-water store , - wherein, via the first heat pump , a heat displacement between the cooling circuit and the heating circuit is realized during operation such that there is simultaneously provided a cooling power on the side of the cooling circuit and a heating power on the side of the heating circuit , - there is arranged an auxiliary unit which is connected, in particular hydraulically, to the cooling circuit and to the heating circuit , wherein the auxiliary unit is configured both for providing additional heat for the heating circuit and for providing additional cold for the cooling circuit , - having a control unit for controlling the operation of the heat-pump installation , wherein the auxiliary unit is a second heat pump which is in the form of an air-liquid heat pump and which is reversibly operable, so that it can feed heat into the heating circuit in a heating mode and can feed cold into the cooling circuit in a cooling mode. - a first heat pump , which is in the form of a liquid-liquid heat pump and is connected on a source side to the heat source and on a sink side to the heat sink, wherein - the heat source comprises a cooling circuit having a cooling feed , a cooling return , a cooling buffer store for cold water, and, in the connected state, a cooling consumer , - the heat sink comprises a heating circuit having a heating feed , a heating return , a heating buffer store for heating water, and a heating consumer , wherein the heating circuit has, as an alternative or in addition to the heating buffer store and the heating consumer , a hot-water store , - wherein, via the first heat pump , a heat displacement between the cooling circuit and the heating circuit is realized during operation such that there is simultaneously provided a cooling power on the side of the cooling circuit and a heating power on the side of the heating circuit , - there is arranged an auxiliary unit which is connected, in particular hydraulically, to the cooling circuit and to the heating circuit , wherein the auxiliary unit is configured both for providing additional heat for the heating circuit and for providing additional cold for the cooling circuit , - having a control unit for controlling the operation of the heat-pump installation , wherein the auxiliary unit is a second heat pump which is in the form of an air-liquid heat pump and which is reversibly operable, so that it can feed heat into the heating circuit in a heating mode and can feed cold into the cooling circuit in a cooling mode. <EOS>