A method for controlling a heat pump laundry drying machine, wherein the heat pump laundry drying machine includes: • a rotatable drum where textile is introduced and treated with a process air, said drum being apt to be driven in two rotation directions; • a heat pump system having a refrigerant circuit in which a refrigerant can flow, said refrigerant circuit including a first heat exchanger where the refrigerant is cooled off, a second heat exchanger where the refrigerant is heated up, a compressor to pressurize and circulate the refrigerant through the refrigerant circuit; said first and/or second heat exchanger being apt to perform heat exchange between said refrigerant flowing in said refrigerant circuit and said process air; • a selector adapted to select alternatively at least an outdoor drying cycle for drying outdoor textiles which have a water repellent layer and/or a waterproof and breathable thin film material with a micro-porous structure, and at least an additional drying cycle for drying other types of textiles, wherein the outdoor drying cycle includes an outdoor main drying phase having settings for a frequency of reversion of rotations of the drum and for the heat pump operation and the additional drying cycle comprises an additional main drying phase having settings for a frequency of reversion of rotations of the drum and for the heat pump operation; wherein the method comprises: • selecting and starting the outdoor drying cycle, and entering the outdoor main drying phase, wherein the outdoor main drying phase includes an outdoor first sub-phase wherein the outdoor textiles humidity is reduced and an outdoor second sub-phase wherein the outdoor textiles temperature and/or a process air temperature indicative of the temperature of the outdoor textiles is controlled to be equal or above 55°C; • starting the outdoor first sub-phase; • reversing the rotation of the drum in the outdoor first sub-phase at a frequency lower than a frequency in the additional main drying phase; • entering the outdoor second sub-phase when the humidity of said outdoor textile is equal or below a first threshold; • in the second sub-phase, decreasing a flow rate of the process air in the drum with respect to a flow rate in the outdoor first sub-phase and with respect to a flow rate in the additional main drying phase. • a rotatable drum where textile is introduced and treated with a process air, said drum being apt to be driven in two rotation directions; • a heat pump system having a refrigerant circuit in which a refrigerant can flow, said refrigerant circuit including a first heat exchanger where the refrigerant is cooled off, a second heat exchanger where the refrigerant is heated up, a compressor to pressurize and circulate the refrigerant through the refrigerant circuit; said first and/or second heat exchanger being apt to perform heat exchange between said refrigerant flowing in said refrigerant circuit and said process air; • a selector adapted to select alternatively at least an outdoor drying cycle for drying outdoor textiles which have a water repellent layer and/or a waterproof and breathable thin film material with a micro-porous structure, and at least an additional drying cycle for drying other types of textiles, wherein the outdoor drying cycle includes an outdoor main drying phase having settings for a frequency of reversion of rotations of the drum and for the heat pump operation and the additional drying cycle comprises an additional main drying phase having settings for a frequency of reversion of rotations of the drum and for the heat pump operation; • selecting and starting the outdoor drying cycle, and entering the outdoor main drying phase, wherein the outdoor main drying phase includes an outdoor first sub-phase wherein the outdoor textiles humidity is reduced and an outdoor second sub-phase wherein the outdoor textiles temperature and/or a process air temperature indicative of the temperature of the outdoor textiles is controlled to be equal or above 55°C; • starting the outdoor first sub-phase; • reversing the rotation of the drum in the outdoor first sub-phase at a frequency lower than a frequency in the additional main drying phase; • entering the outdoor second sub-phase when the humidity of said outdoor textile is equal or below a first threshold; • in the second sub-phase, decreasing a flow rate of the process air in the drum with respect to a flow rate in the outdoor first sub-phase and with respect to a flow rate in the additional main drying phase.