A low-temperature dryer, especially a compressed air low-temperature dryer, for drying of a gaseous working fluid with cooling of the gaseous working fluid by use of a refrigerant comprises a pre-heat exchanger section (11) and a main heat exchanger section (12), in which the pre-heat exchanger section (11) and/or the main heat exchanger section (12) comprises at least one, preferably elongated heat exchanger element. Cooling of the working fluid introduced to the low-temperature dryer occurs here in the pre-heat exchanger section (11) from the dried and cooled working fluid. Additional cooling of the precooled working fluid passed through the low-temperature dryer occurs in the main heat exchanger section (12) from the refrigerant, so that moisture is condensed from the working fluid. All flow channels (21, 22) of the pre-heat exchanger section (11) and/or the main heat exchanger section (12) are formed essentially by hollow chamber profiles.