The invention relates to a method and a device used to produce a compressed gas flow (304, 5) and which can be used, for example, in a method or a device for separating air at a low-temperature. Compression heat is removed from a gas flow (1) compressed in a gas compressor in a two-step cooling unit which is formed by a first and a second bundle (21, 22) of helically wound tubes, both bundles (21, 22) being arranged in a common container (20).