Makes a comparison between the effects on thermal performance and energy use of a number of pre-cooling and ventilation strategies, suitable for use to reduce peak power demands in office buildings in moderate temperature regions. Describes how simulations were performed for different building envelope parts, and for two levels of internal heat load. Lists the results as significant reductions of required daytime peak power loads which may be obtained by cooling strategies that contribute to lowering the internal mass temperatures. States that intensive night pre-cooling is the most effective strategy to smooth power loads, for those buildings with large internal heat loads. Concludes that it is a very efficient strategy for non-loaded buildings.