Use of a gaseous mixture, selected from the group consisting of—propylene in a concentration from 90% to 99% by weight and a gas selected from the group consisting of butene, ethylene and ethane or mixtures thereof in a concentration from 1% to 10% by weight; as replacement or alternative refrigerant gas for R404A, R507A and/or R407C, and/or other replacement or alternative refrigerants for R404A, R507A and R407C containing HFC (hydrofluorocarbons), HFO (hydrofluoro olefins) and HFE (hydrofluoro ethers).