A method for supplying a mask through which air flows with a regulated degree of humidification (m) is provided. The method may include: providing a water reservoir configured such that the air circulates in contact with the surface of water within the reservoir is charged with humidity； providing a heating device for heating the water in the reservoir by circulating an electric current； measuring an average intensity (Iav) of the current passing through the heating device； and controlling the average intensity (Iav) relative to a reference value (Iavc) to obtain a degree of humidification (m) of the air that is independent of the ambient temperature (Ta). An apparatus for regulating the degree of humidification of air flow, as well as a heating humidifier including such a regulation device, are also provided.
