The King’s House on the Schachen is an impressive example of late 19th century royal interior design from the times of King Ludwig II of Bavaria. The building is a wooden construction in Swiss Chalet Style with a standard interior in the lower floor and an eccentric oriental palace room on the entire upper floor. Situated in the Bavarian Alps on the Schachen Mountain opposite the Zugspitze at around 1800 m it faces a very rough mountain climate with cold winters, hot summers and extreme and fast weather changes. Nevertheless the state of preservation of the interior and the works of arts inside the Chalet is extraordinary good. The paper will focus on the statistical analysis the indoor environment in regard to the state of preservation as well as on the relation to outdoor climate, use during summer and effects of the interior and the building envelope. For the simulation of the hygrothermal behaviour the software tool WUFI Plus will be used.