Abstract Evaluating the solid–liquid equilibrium and the eutectic composition of a mixture is fundamental for the estimation of the lowest temperature at which the blend can be used as a refrigerant fluid. The study on the solid–liquid equilibrium for some selected systems was undertaken to fill the gap in the literature on the solid–liquid equilibrium of alternative refrigerants. A new experimental set-up was used and the system's behavior was measured down to temperatures of 130 K for three binaries, i.e. CO 2 + N 2 O, CO 2 + R32 and N 2 O + R32. The set-up enabled us to record not only temperature and composition , but also pressure data. The triple points of the pure fluids contained in the mixture were measured to check the reliability of the new apparatus, revealing a good consistency with the literature. The results obtained for the mixtures were interpreted by means of the Schroder equation.