Variations in householders' window opening patterns.

Describes a window opening survey concerned with identifying the objective correlates of window opening. Finds that the variation between households in terms of their total daily window opening is greater than that within households. Householders may adopt consistent window opening patterns. Hypothesises that although window opening is primarily a function of external air temperature, relative humidity and windspeed are influential at high values. Also suggests that all households follow a similar curve of window opening against increases in temperature but that the threshold temperature marking the foot of the curve varies from one household to another.