Abstract: A dynamic insulation system suitable for deployment within an envelope or facade of a building or habitable construction is described. The system comprises one or more layers of insulation and one or more void space forming elements (5,12b). The void space forming element comprises a panel attachment means (6) for connecting this element to a layer of insulation and a spacer element (9) that provides a means for defining at least one void space within the envelope or facade to facilitate the uniform, bi-directional, actively or passively driven flow of ventilation air through the void space. The resultant dynamic insulation systems can be made directly from any commonly available insulation sheet material, or combination of materials. This reduces the costs of the system without sacrificing performance or versatility. The system can be cut to any dimension, and joined together without loss of functionality to maximise insulation coverage of the building envelope or facade.