A laundry dryer including: - a casing rotatably supporting a drum for receiving a load to be dried, said drum being apt to rotate around a drum axis, said casing including o a rear wall and a front wall, an aperture being realized on said front wall to access said drum; o a basement defining a basement plane (X,Y) and in which basement a first longitudinal half (24 first half) and a second longitudinal half (24 second half) are identifiable by means of a first plane perpendicular to said basement plane (X,Y) and passing through said drum axis; - A process air conduit in fluid communication with the drum where a process air stream is apt to flow; - A heat pump system having a heat pump circuit in which a refrigerant can flow, said heat pump circuit including a first heat exchanger where the refrigerant is cooled off and the process air is heated up, and a second heat exchanger where the refrigerant is heated up and the process air is cooled off; said first heat exchanger and/or said second heat exchanger being arranged in the process air conduit within said first longitudinal half (24 first half) of said basement for the majority of their volume in order to perform heat exchange between said refrigerant flowing in said heat pump circuit and said process air; - Said process air conduit including a basement air duct formed in said basement, said basement air duct comprising a basement duct portion channeling said process air between a process air exit where process air exits from said first heat exchanger and a process air outlet where process air exits said basement, said outlet being located within said second longitudinal half (24 second half) of said basement, said basement duct portion including one or more duct walls which in a section along a sectioning plane parallel to said basement plane (X, Y) defines an inner curve and an outer curve, said outer curve being the curve closer to the rear wall of the casing among the two curves (28a, 28b); characterized in that a tangent (T1, T2, T3) to said inner curve of said basement duct portion in said second longitudinal half (24 second half) of said basement forms an angle different from 90° with an axis formed by sectioning said first plane with said sectioning plane for at least between 90% and 100% of the length of the inner curve in said second longitudinal half (24 second half). - a casing rotatably supporting a drum for receiving a load to be dried, said drum being apt to rotate around a drum axis, said casing including o a rear wall and a front wall, an aperture being realized on said front wall to access said drum; o a basement defining a basement plane (X,Y) and in which basement a first longitudinal half (24 first half) and a second longitudinal half (24 second half) are identifiable by means of a first plane perpendicular to said basement plane (X,Y) and passing through said drum axis; o a rear wall and a front wall, an aperture being realized on said front wall to access said drum; o a basement defining a basement plane (X,Y) and in which basement a first longitudinal half (24 first half) and a second longitudinal half (24 second half) are identifiable by means of a first plane perpendicular to said basement plane (X,Y) and passing through said drum axis; - A process air conduit in fluid communication with the drum where a process air stream is apt to flow; - A heat pump system having a heat pump circuit in which a refrigerant can flow, said heat pump circuit including a first heat exchanger where the refrigerant is cooled off and the process air is heated up, and a second heat exchanger where the refrigerant is heated up and the process air is cooled off; said first heat exchanger and/or said second heat exchanger being arranged in the process air conduit within said first longitudinal half (24 first half) of said basement for the majority of their volume in order to perform heat exchange between said refrigerant flowing in said heat pump circuit and said process air; - Said process air conduit including a basement air duct formed in said basement, said basement air duct comprising a basement duct portion channeling said process air between a process air exit where process air exits from said first heat exchanger and a process air outlet where process air exits said basement, said outlet being located within said second longitudinal half (24 second half) of said basement, said basement duct portion including one or more duct walls which in a section along a sectioning plane parallel to said basement plane (X, Y) defines an inner curve and an outer curve, said outer curve being the curve closer to the rear wall of the casing among the two curves (28a, 28b); characterized in that