A refrigerator comprises a compartment for preserving foods at a controlled temperature and positioned within a refrigerator cabinet which also comprises a compartment of temperature less than 0°C. The refrigerator comprises an interspace (K) defined by a wall (1a) of the refrigeration compartment (1), and at least one air conduit to connect the compartment (H) of temperature less than 0°C to the interspace (K) in order to cool the refrigeration compartment for preserving foods at a controlled temperature.