Laundry treatment apparatus, in particular dryer or washing machine having drying function, comprising: a laundry storing chamber for treating laundry using process air, a process air loop (18, 20) for circulating the process air through the laundry storing chamber, and a heat pump system for dehumidifying and heating the process air, the heat pump system having a refrigerant loop comprising: a first heat exchanger for heating a refrigerant and cooling the process air, a second heat exchanger for cooling the refrigerant and heating the process air, a refrigerant expansion device arranged in the refrigerant loop between the second heat exchanger and the first heat exchanger, a compressor arranged in the refrigerant loop between the first heat exchanger and the second heat exchanger, and a process air heat exchanger (26, 26b-c) arranged at or in the process air loop upstream of the first heat exchanger for providing heat exchange between the process air and cooling air, wherein the process air heat exchanger provides a pre-cooling of the process air upstream the first heat exchanger, wherein the process air loop (18, 20) comprises a process air channel, the process air channel comprising a channel section unit; characterized in that the process air heat exchanger (26, 26b-c) is at least partially integrated in or is part of said channel section unit in which the process air coming from the laundry storing chamber is deflected from the downward direction to the horizontal direction, the process air heat exchanger (26b-c) comprises at least one cooling air channel arranged in and guided through the channel section unit and wherein the at least one cooling air channel is in heat contact with the process air flowing through the channel section unit, and said channel section unit is a fluff filter unit and/or a service access unit of the apparatus. a laundry storing chamber for treating laundry using process air, a process air loop (18, 20) for circulating the process air through the laundry storing chamber, and a heat pump system for dehumidifying and heating the process air, the heat pump system having a refrigerant loop comprising: a first heat exchanger for heating a refrigerant and cooling the process air, a second heat exchanger for cooling the refrigerant and heating the process air, a refrigerant expansion device arranged in the refrigerant loop between the second heat exchanger and the first heat exchanger, a compressor arranged in the refrigerant loop between the first heat exchanger and the second heat exchanger, and a process air heat exchanger (26, 26b-c) arranged at or in the process air loop upstream of the first heat exchanger for providing heat exchange between the process air and cooling air, wherein the process air heat exchanger provides a pre-cooling of the process air upstream the first heat exchanger, wherein the process air loop (18, 20) comprises a process air channel, the process air channel comprising a channel section unit; characterized in that the process air heat exchanger (26, 26b-c) is at least partially integrated in or is part of said channel section unit in which the process air coming from the laundry storing chamber is deflected from the downward direction to the horizontal direction, the process air heat exchanger (26b-c) comprises at least one cooling air channel arranged in and guided through the channel section unit and wherein the at least one cooling air channel is in heat contact with the process air flowing through the channel section unit, and said channel section unit is a fluff filter unit and/or a service access unit of the apparatus. a first heat exchanger for heating a refrigerant and cooling the process air, a second heat exchanger for cooling the refrigerant and heating the process air, a refrigerant expansion device arranged in the refrigerant loop between the second heat exchanger and the first heat exchanger, a compressor arranged in the refrigerant loop between the first heat exchanger and the second heat exchanger, and a process air heat exchanger (26, 26b-c) arranged at or in the process air loop upstream of the first heat exchanger for providing heat exchange between the process air and cooling air, wherein the process air heat exchanger provides a pre-cooling of the process air upstream the first heat exchanger, wherein the process air loop (18, 20) comprises a process air channel, the process air channel comprising a channel section unit; characterized in that the process air heat exchanger (26, 26b-c) is at least partially integrated in or is part of said channel section unit in which the process air coming from the laundry storing chamber is deflected from the downward direction to the horizontal direction, the process air heat exchanger (26b-c) comprises at least one cooling air channel arranged in and guided through the channel section unit and wherein the at least one cooling air channel is in heat contact with the process air flowing through the channel section unit, and said channel section unit is a fluff filter unit and/or a service access unit of the apparatus.