A laundry treatment apparatus, in particular a dryer (2a) or washing machine having a drying function, includes a cabinet having a front wall, a rear wall, side walls and a base section. The base section has an internal side facing the interior of the cabinet and an external side exposed to the outside of the cabinet. A laundry storing chamber for treating laundry using process air (A), a process air loop for circulating the process air through the laundry storing chamber, and a heat pump system for dehumidifying and heating the process air are also provided. The heat pump system has a refrigerant loop comprising: a first heat exchanger (10) for heating a refrigerant and cooling the process air (A), a second heat exchanger (12) for cooling the refrigerant and heating the process air, a refrigerant expansion device, a compressor, and an auxiliary heat exchanger (13). The auxiliary heat exchanger (13) is arranged at the external side of the base section.