The use of a whole heat exchange unit can effectively solve the problem of moisture in the air, as shown in the before-and-after images. In the first image, the walls and ceilings are covered with water droplets, creating an uncomfortable and damp atmosphere. In the second image, after installing the wall-mounted whole heat exchange unit, the walls and ceilings are dry and comfortable, creating a refreshing and pleasant living environment. The images should be photorealistic and bright, with a focus on the transformative effect of the whole heat exchange unit on the room's humidity levels.