This design and construct project was to air condition and provide humidity control to this heritage 1913 munitions store on Spectacle Island. The building had to provide conditions in which the Navy could store memorabilia including such delicate and priceless documents as the commissions of a number of early Australian Commodores. The design phase involved definition, with our heritage consultant, of the parameters for the climate control installation to meet the heritage listing conditions both specific to the building and to the Island, and also the design of the plant, equipment and controls of the climate control system. While the building, being a munitions store, was of very substantial construction the steel blast panels in window openings and the roof structure, designed as the weak point in the event of explosion, are permeable and the building set only just above high tide. This made achieving temperatures and humidity in which mold spores would not propagate in all seasons and 24 hours a day a major challenge, but one that was both fascinating and successful.