Insulation system for insulating an interior space, which interior space is separated from an exterior space by means of a wall comprising an inner wall and an outer wall with a cavity in between, wherein the insulation system comprises: - a thermally insulating partition which is permeable to a gaseous through-flow medium, and - a fan for a gaseous through-flow medium, wherein the thermally insulating partition is configured to be arranged in the cavity in such a way between the inner wall and the outer wall, that the cavity is divided into an inner cavity and an outer cavity, wherein the inner cavity is delimited by the inner wall and the thermally insulating partition and wherein the outer cavity is delimited by the outer wall and the thermally insulating partition, and wherein the thermally insulating partition separates the inner cavity from the outer cavity, and wherein the fan is configured to produce a pressure difference between the inner cavity and the outer cavity, and thus to bring about a displacement of a gaseous through-flow medium through the thermally insulating partition, characterized in that the thermally insulating partition comprises a serpentine-shaped part which is made from a foil, for example a transparent foil, for example a plastic foil which is transparent to daylight, which foil is folded to form a serpentine shape, the serpentine-shaped part comprising peaks and troughs separated from each other by means of flanks, wherein spacers are provided in order to keep adjacent flanks of the serpentine-shaped part a mutual distance apart, and wherein the flanks are closed to the gaseous through-flow medium, and wherein perforations are arranged in the foil at the peaks and at the troughs of the serpentine-shaped part, in such a way that the serpentine-shaped part defines multiple parallel ducts which extend between the flanks of the serpentine-shaped part and which are each delimited at one end thereof by either a peak or a trough of the serpentine-shaped part, and wherein the perforations at said peak or said trough form inflow apertures or outflow apertures for the gaseous through-flow medium through the respective duct due to the effect of the pressure difference between the inner cavity and the outer cavity brought about by the fan. - a thermally insulating partition which is permeable to a gaseous through-flow medium, and - a fan for a gaseous through-flow medium, wherein the thermally insulating partition is configured to be arranged in the cavity in such a way between the inner wall and the outer wall, that the cavity is divided into an inner cavity and an outer cavity, wherein the inner cavity is delimited by the inner wall and the thermally insulating partition and wherein the outer cavity is delimited by the outer wall and the thermally insulating partition, and wherein the thermally insulating partition separates the inner cavity from the outer cavity, and wherein the fan is configured to produce a pressure difference between the inner cavity and the outer cavity, and thus to bring about a displacement of a gaseous through-flow medium through the thermally insulating partition, characterized in that the thermally insulating partition comprises a serpentine-shaped part which is made from a foil, for example a transparent foil, for example a plastic foil which is transparent to daylight, which foil is folded to form a serpentine shape, the serpentine-shaped part comprising peaks and troughs separated from each other by means of flanks, wherein spacers are provided in order to keep adjacent flanks of the serpentine-shaped part a mutual distance apart, and wherein the flanks are closed to the gaseous through-flow medium, and wherein perforations are arranged in the foil at the peaks and at the troughs of the serpentine-shaped part, in such a way that the serpentine-shaped part defines multiple parallel ducts which extend between the flanks of the serpentine-shaped part and which are each delimited at one end thereof by either a peak or a trough of the serpentine-shaped part, and wherein the perforations at said peak or said trough form inflow apertures or outflow apertures for the gaseous through-flow medium through the respective duct due to the effect of the pressure difference between the inner cavity and the outer cavity brought about by the fan.