A method and a device for regulating the temperature inside a building having walls that include an inner microporous wall separated from a thermally insulating outer wall by a sheet of air, the device having a data processor configured to drive and control the circulation of outside air between the double walls of the building so as to act as a function of climatic conditions to regulate the temperature and the hygrometry inside the building by evaporating and condensing a fraction of the humidity of the microporous inner wall of the double walls of the building.