Device for providing heat output for a laundry treatment appliance, in particular for a washing machine or a washer-dryer, said device comprising the following features: an input-side ambient air interface for conducting ambient air; an input-side treatment fluid interface (106; 206, 207) for conducting treatment fluid out of a laundry treatment chamber of the laundry treatment appliance; an evaporator which is designed to evaporate a liquid coolant using the ambient air and to provide said coolant as a gaseous coolant; a condenser which is designed to heat the treatment fluid using the gaseous coolant and to provide said fluid as heated treatment fluid; and an output-side treatment fluid interface (108; 208, 209) for conveying the heated treatment fluid away to the laundry treatment chamber, the input-side treatment fluid interface (106; 206, 207) being configured as an input-side process air interface for conducting process air out of the laundry treatment chamber as the treatment fluid, and the output-side treatment fluid interface (108; 208, 209) being configured as an output-side process air interface for conveying the heated process air away to the laundry treatment chamber, and/or in which the input-side treatment fluid interface (106; 206, 207) is configured as an input-side recirculation interface for conducting treatment fluid out of the laundry treatment chamber as the treatment fluid, and the output-side treatment fluid interface (108, 208, 209) is configured as an output-side recirculation interface for conveying the heated treatment fluid away to the laundry treatment chamber, characterised by an input-side distribution means which is designed to couple the input-side ambient air interface to the evaporator in a first operating state and to couple the input-side process air interface to the evaporator in a second operating state, the evaporator being designed to evaporate the liquid coolant using the ambient air and provide said coolant as the gaseous coolant in the first operating state, and to evaporate the liquid coolant using the process air and provide the coolant as of the gaseous coolant in the second operating state. an input-side ambient air interface for conducting ambient air; an input-side treatment fluid interface (106; 206, 207) for conducting treatment fluid out of a laundry treatment chamber of the laundry treatment appliance; an evaporator which is designed to evaporate a liquid coolant using the ambient air and to provide said coolant as a gaseous coolant; a condenser which is designed to heat the treatment fluid using the gaseous coolant and to provide said fluid as heated treatment fluid; and an output-side treatment fluid interface (108; 208, 209) for conveying the heated treatment fluid away to the laundry treatment chamber, the input-side treatment fluid interface (106; 206, 207) being configured as an input-side process air interface for conducting process air out of the laundry treatment chamber as the treatment fluid, and the output-side treatment fluid interface (108; 208, 209) being configured as an output-side process air interface for conveying the heated process air away to the laundry treatment chamber, and/or in which the input-side treatment fluid interface (106; 206, 207) is configured as an input-side recirculation interface for conducting treatment fluid out of the laundry treatment chamber as the treatment fluid, and the output-side treatment fluid interface (108, 208, 209) is configured as an output-side recirculation interface for conveying the heated treatment fluid away to the laundry treatment chamber, characterised by an input-side distribution means which is designed to couple the input-side ambient air interface to the evaporator in a first operating state and to couple the input-side process air interface to the evaporator in a second operating state, the evaporator being designed to evaporate the liquid coolant using the ambient air and provide said coolant as the gaseous coolant in the first operating state, and to evaporate the liquid coolant using the process air and provide the coolant as of the gaseous coolant in the second operating state.