With heat in the room, people at all times fought in different ways. For example, in the Mediterranean countries, the floors in the premises made stone, and even moistened with water, and in the summer it gave cool. In the villages in the summer they preferred to sleep on the hayloft. The apartments had to open windows and doors. Fans appeared, but they were small and helped only one person in front of whom he stood. And the fan under the ceiling did not at all reduce the air temperature. And only the air conditioner helped to radically solve the problem of heat in any room.