A device for heating, generating electric power and cooling enclosed spaces, which is connected to at least one closed-circuit pipe which acts by thermal radiation and comprises at least one turbine or microturbine of the axial or tangential type or of the type that merges into the closed-circuit pipe, placed in partial vacuum by means of a first fan. An alternator for generating electric power and elements for feeding the power to the grid or to user devices, and an absorber for generating cool air or refrigerated water, are connected to the turbine or microturbine.