In order to clarify the influence of air-conditioning on female workers, the survey with questionaire was made in a printing factory. In summer (August), autumn (October) and winter (December), 210 female workers engaged in light inspective tasks were asked about their whole body thermal sensations, local thermal sensations (on forehead, shoulder, hand, waist and foot), comfort sensations, health statuses and clothings. Air temperature, air humidity, air velocity and radiation convection temperature were measured simultaneously, and corrected effective temperature (CET) was calculated by the chart. The results obtained were as follows:
1) The average comfort temperatures in the thermal sensations were CET of 22.6°C in summer, 21.4°C in autumn and 20.3°C in winter. There was a seasonal difference in the optimum thermal condition for the workers.
2) Because of wide vertical range of air temperature in air-heating season, the incidences of local warmth feeling on face and feeling of chilled waist and feet in winter were higher than that in summer and autumn.
3) Under the same thermal conditions, the workers felt warmer in the afternoon than in the morning. This might be explained by the elevation in the metabolism due to specific dynmic action after the lunch.
4) Unhealthy workers tended to vote thermal sensation for“cold”or“hot”more frequently than healthy workers.
5) The ratios of wearing undershirt, drawers and rug of workers voted thermal sensation for“cold”were higher than that of workers voted thermal sensation for“hot”.
6) Middle aged workers (40-59 year old) felt warmer than young workers (18-39 year old) under the same thermal conditions, mainly because the ratios of wearing undershirt and drawers of middle aged workers were higher than that of young workers.