The disadvantage of air conditioning in large buildings is that the thermal energy from outside heats the airspace of up to 200. 000 m³. To cool this large amount of air down to the right temperature, it must be replaced with cooled air several times a day. On the one hand, this air exchange is associated with a high energy consumption, on the other hand, heat is transferred from the building to the outside, thereby increasing the air temperature near the building.