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A research is being carried out concerning the use of windows and doors in an appartrent building in Schiedam in the Netherlands, The investigations consist of an inquiry end of continous measurements for a period of about two years on 1280 windows and doors of 8O dwellings, During the measurements there is only a distinction between the closed and not-closed positions of windows and outside doors, because simple switches are used. The following conclusions can be drawn: - the measurement technique is reliable even if the visibility is bad. - there is a linnear relation between the weekly mean of the number of open windows and outside doors and the mean outside temperature. - there is a characteristic day-night pattern for the use of doors, pivoting windows and flap windows for the living room, the bedrooms, the kitchen, galery side and balcony side. - the most important motive for ventilation is the discharge of polluted indoor air. - 25% of the windows that are open are set ajar, 75% are openedmore wide. - there is a good correspondence of the results of the inquiry and those of the measurements - the windows and doors that are open during too many hours a day result in a mean estimated heatingloss of 4.5 GJ per heating season per dwelling