The climate aggregate is needed, because a lot of electric and electronic equipment is working like a heating. In the small room there are approx. 300W lights, 2x 250W power supply for the flightdeck and 7 PC´s with 200W each. So, the heating power is approx. 2.200W. That is enough, to heat the room in winter days over 27°C and in summer days between 30°C and 35°C.