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Indoor climate has a strong influence on the preservation of interiors; the effects on the surfaces of valuable furnishing and artworks are of major concern. To evaluate the indoor climate thorough measurements have to be made. But how should this data be analysed? There are some established and some newer methods to evaluate measured climate data. The authors present here a new analytical method and its application on measured climate data from unheated historic buildings such as the King's House on the Schachen, Linderhof Palace and the small rural church of St. Margaretha in Roggersdorf. Within this new method a moving average is used for the analysis of short-term fluctuations of relative humidity and temperature. As a result a moving fluctuation range of relative humidity is obtained for example the maximum range in an hourly moving interval of 24 hours compared to the commonly used values of equidistant daily cycles. Conventional methods of statistical analysis are compared to the new method for different time periods. Advantages and disadvantages of the different approaches are discussed. A further result of this new method is the better understanding of the indoor environment and improved evaluation of measured data. A perspective is presented on possible applications of the moving fluctuation range method for investigations on the real physical behavior of collections due to fluctuations in relative humidity. The moving fluctuation range method can also be used in building simulation tools for evaluation of indoor climate conditions for collections.
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