Discusses the use of a building thermal analysis methodology in which the stochastic nature of the external climate is considered. States the method provides a rational and convenient way of handling uncertainty in the analysis and design of the thermal system. Uses a set of stochastic difference equations to model the thermal behaviour of the building, which provides the means and standard deviations of the room air temperature and cooling load, Applies the method to a small-scale problem for verification purposes.

KEYWORDS: Calculating, air conditioning, buildings, cooling load, intermittent, sizing, air temperature, room temperature.