Redundant cooling systems and methods are disclosed. In an exemplary embodiment, a method for redundant cooling system of computer systems and other electronics may comprise thermally connecting a cooling fluid to one or more heat-generating components to absorb heat from the heat-generating components during operation. The method may also comprise thermally connecting the cooling fluid to a primary coolant and a secondary coolant. The method may also comprise exchanging heat between the cooling fluid and the primary coolant or the secondary coolant to remove heat from the cooling fluid even if one of the cooling sources is unavailable.