Air conditioners without systems of regeneration of energy for observance of parameters of temperature and humidity according to DIN 1946 such components, as a heater, a cooler and a dampener, on the one hand, for heating and humidifying in winter, on the other hand – for cooling and moisture removal are required in summer. Compare conditioners S2-15-25 with air volume 10000 m3/h in Zurich, which have speed of air in heat exchanger 2 m/s.