An apparatus and method for performing warming therapy is described. In one exemplary embodiment, the apparatus includes a base (12) for supporting a medical patient and a humidifier module (26) removably coupled to the base (12). The humidifier module (26) may include a main reservoir (50) and an evaporator reservoir (52) separated by a channel (70). Both the main and evaporator reservoirs (50, 52) may be protected by a cover (58), which may be made removable. The design of the humidifier module (26) is such that the component parts thereof may be easily removed, so that the reservoir body (48) including the main reservoir (50) and the evaporator reservoir (52) may be easily cleaned, such as through use of an autoclave.