The kinds of collections that would likely be safe in these structures would consist of all, but the most delicate of materials. Museum quality collections of fine arts, inlays, conserved collections, and finely crafted arts should all be safe here. There would be no occupancy restrictions relating to user comfort in these facilities. Precision climate control systems with specialty components are employed. These structures are generally small in size due to their high construction cost and operating cost.
Examples are vaults, storage rooms, and specialty cases or enclosures.
Environmental conditions in these structures are specifically designed for their contents and are held constant within the limits of the chosen technology of precision accuracy. The materials might include unique minerals, chemically damaged objects such as some bronzes, composite materials with mismatched expansion coefficients, some photographs and perhaps extremely old materials. Only limited access would be permitted in these facilities. Once the natural thermal limits of a structure are known, it is then put to the test mathematically, as six heat loads are imposed on it. This is the heat energy of the sun which passes through glass windows, doors and skylights.