A method of operation of a household appliance for drying laundry, the household appliance comprising: - a rotating drum designed to house the laundry to be dried; - a drying compartment, wherein the drum is located; - a line for taking air for drying from said compartment and for re-introducing the same air in the compartment; - a heat pump for treating the air for drying, said heat pump comprising a circuit wherein a working fluid circulates, said circuit, in turn, comprising: i) a condenser for condensing the working fluid, said condenser interacting with the drying air flowing in said line; ii) a first and a second evaporator (41, 42) of the working fluid in thermal contact with the drying air flowing in said line; following the direction of flow of the drying air along said line, the condenser being downstream of the first and the second evaporator (41, 42); iii) a working fluid conduit that comprises a zone wherein it divides into a first and a second branch (431, 432) comprising a first and a second thermal expansion member (61, 62), respectively, said first branch passing through said first evaporator, said second branch passing through said second evaporator; said zone wherein the conduit divides being downstream of the condenser and upstream of the first and the second evaporator (41, 42) according to the direction of flow of the working fluid; iv) a compressor for compressing the working fluid, said compressor being located downstream of the first and the second evaporator (41, 42) and upstream of the condenser along the direction of flow of the working fluid; v) control means for controlling the supply of working fluid coming from the first and the second branch (431, 432) in said compressor, characterized in that it comprises the steps of: A) determining a value of the weight of the laundry to be dried that has been placed in the drum; B) having said working fluid flow in both the first and the second evaporator (41, 42) should said value exceed a pre-established threshold. - a rotating drum designed to house the laundry to be dried; - a drying compartment, wherein the drum is located; - a line for taking air for drying from said compartment and for re-introducing the same air in the compartment; - a heat pump for treating the air for drying, said heat pump comprising a circuit wherein a working fluid circulates, said circuit, in turn, comprising: i) a condenser for condensing the working fluid, said condenser interacting with the drying air flowing in said line; ii) a first and a second evaporator (41, 42) of the working fluid in thermal contact with the drying air flowing in said line; following the direction of flow of the drying air along said line, the condenser being downstream of the first and the second evaporator (41, 42); iii) a working fluid conduit that comprises a zone wherein it divides into a first and a second branch (431, 432) comprising a first and a second thermal expansion member (61, 62), respectively, said first branch passing through said first evaporator, said second branch passing through said second evaporator; said zone wherein the conduit divides being downstream of the condenser and upstream of the first and the second evaporator (41, 42) according to the direction of flow of the working fluid; iv) a compressor for compressing the working fluid, said compressor being located downstream of the first and the second evaporator (41, 42) and upstream of the condenser along the direction of flow of the working fluid; v) control means for controlling the supply of working fluid coming from the first and the second branch (431, 432) in said compressor, i) a condenser for condensing the working fluid, said condenser interacting with the drying air flowing in said line; ii) a first and a second evaporator (41, 42) of the working fluid in thermal contact with the drying air flowing in said line; following the direction of flow of the drying air along said line, the condenser being downstream of the first and the second evaporator (41, 42); iii) a working fluid conduit that comprises a zone wherein it divides into a first and a second branch (431, 432) comprising a first and a second thermal expansion member (61, 62), respectively, said first branch passing through said first evaporator, said second branch passing through said second evaporator; said zone wherein the conduit divides being downstream of the condenser and upstream of the first and the second evaporator (41, 42) according to the direction of flow of the working fluid; iv) a compressor for compressing the working fluid, said compressor being located downstream of the first and the second evaporator (41, 42) and upstream of the condenser along the direction of flow of the working fluid; v) control means for controlling the supply of working fluid coming from the first and the second branch (431, 432) in said compressor, A) determining a value of the weight of the laundry to be dried that has been placed in the drum; B) having said working fluid flow in both the first and the second evaporator (41, 42) should said value exceed a pre-established threshold.