The invention relates to a sunshade device, in particular to a sunshade device for building openings-A valve (30) having an inner surface (34) and an outer surface (38) comprising an absorbent material (36) forming an outer surface (38),-An absorbent material wetting device (20) having wetting control devices (50, 60).According to the invention, the device further comprises:-At least one humidity sensor (82a, 82B, 82C) is mounted on the outer surface of the valve, and-A control unit (80) of the sunscreen device is connected with the wetting control devices (50, 60) of the wetting device (20) and configured to trigger the operation of the wetting device respectively according to at least one measurement of the humidity sensor (82a), 82b、82c）。Air conditioning applications in residential, industrial or agricultural buildingsFigure 1
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