A refrigeration circuit for household appliances, in particular household appliances for cooling such as refrigerators, freezers and the like, comprising: - at least one first heat exchanger, suitable for being brought into fluid communication with a compressor, for allowing cooling of a cooling fluid substantially in the liquid phase passing therethrough; - at least one second heat exchanger in fluid communication with said first exchanger and active at a space to be cooled, said second exchanger allowing the cooling fluid at least partly in the gaseous phase to absorb heat thereby cooling said space, the cooling fluid circulating from the first exchanger, towards the second exchanger and thus being directable to a compressor for a subsequent cycle; and - a throttling device arranged between said first and second heat exchangers for generating an expansion of said cooling fluid, at least one of said first and second heat exchangers comprising at least one flexible tubing, characterised in that at least one portion of said tubing exhibits such a corrugated profile as to impart flexibility thereto, and in that said tubing seen in section exhibits at least one layer of plastic material and at least one layer comprising metal material, the metal layer being associated with the layer of plastic material, said metal material being adapted to constitute a barrier to passage of humidity, wherein said layer of plastic material is a layer the structural function of which is to maintain the shape of tubing, said layer being made of a thermoplastic material, wherein said metal layer is flexible, has no function of structural support and comprises a single-layer film of metal or a multi-layer film comprising one or more metal films coupled or not to a layer of material adapted to maintain a deformed shape. - at least one first heat exchanger, suitable for being brought into fluid communication with a compressor, for allowing cooling of a cooling fluid substantially in the liquid phase passing therethrough; - at least one second heat exchanger in fluid communication with said first exchanger and active at a space to be cooled, said second exchanger allowing the cooling fluid at least partly in the gaseous phase to absorb heat thereby cooling said space, the cooling fluid circulating from the first exchanger, towards the second exchanger and thus being directable to a compressor for a subsequent cycle; and - a throttling device arranged between said first and second heat exchangers for generating an expansion of said cooling fluid, at least one of said first and second heat exchangers comprising at least one flexible tubing, characterised in that at least one portion of said tubing exhibits such a corrugated profile as to impart flexibility thereto, and in that said tubing seen in section exhibits at least one layer of plastic material and at least one layer comprising metal material, the metal layer being associated with the layer of plastic material, said metal material being adapted to constitute a barrier to passage of humidity, wherein said layer of plastic material is a layer the structural function of which is to maintain the shape of tubing, said layer being made of a thermoplastic material,