#$%^&*AU2014203085A120140703.pdf#####ABSTRACT The invention provides a heat transfer composition comprising (i) a first component selected from trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)), cis-1 ,3,3,3-tetrafluoropropene (R5 1234ze(Z)) and mixtures thereof (ii) carbon dioxide (R-744) and (iii) a third component selected from difluoromethane (R-32) 1,1,1,2-tetrafluoroethane (R-134a) and mixtures thereof.