Even if they are not visible, they are the first things to be noticed when entering a room: the temperature and humidity. Both factors ensure comfortable and healthy living. Likewise, you can work more concentrated and focused at your workplace if there is optimum humidity in the office. Depending on how the room is used, a healthy room climate is between 18 and 24 °C. In contrast, the ideal air humidity is 35-65%. Proper ventilation is a prerequisite for maintaining these values. A tilted window hardly helps during an eight-hour working day. It is much better to open the windows wide several times a day and, in the best case, to ventilate the rooms crossways with the doors also open. This so-called push ventilation ensures that the walls do not cool down, as is the case with tilted windows. It also prevents condensation of humidity on the walls.