The invention relates to a method for controlling the temperature of a building (10) having at least one cooling/heating system (30), which is integrated in a ceiling (18) of the building (10) and through which a liquid flows, in which method an ambient air temperature of the building (10) is measured and a target value for a feed temperature of the liquid is generated according to the measured ambient air temperature. The method is characterized in that a fictitious ambient air temperature predicted for a future point in time is used to generate the target value of the feed temperature, a base value of the predicted ambient air temperature being determined as a function value of a function that maps points in time within a day to predetermined temperature values, a radiation temperature of the sky above the building being measured and a degree of cloudiness being determined according to the measured radiation temperature, a correction value being generated according to the determined degree of cloudiness, the base value being combined with the correction value, and the fictitious ambient air temperature predicted for the future point in time being generated as a function of the combination.