Airsol high speed KVS WRG systems work with maximum exchange degrees. On the exhaust side we warm up the water glycol mixture (buffer fluid) as close as possible to the exhaust air temperature. The warmed up medium circulated to the outside air systems is able to warm up the outside air again. That is Airsol heat-transfer agent at a maximum exchange degree. The correctly adjusted water glycol quantity in the intermediate circuit guarantees the maximum temperature difference. In the case of summer the exhaust air is moistened adiabatically and the intermediate circuit is cooled. Adiabatic supply air cooling develops. The effect is maximized by the use of Mountair’s hybrid cooling sections. With connected systems several exhaust air systems and supply air systems are interconnected. The Airsol controller monitors and stops the ideal fluid quantities and guarantees a maximum heat recovery. The entire unit is optimized. A better exchange degree means also higher air resistance. If the additionally spent energy reserve is more valuable than the recovered warmth then it forced the system. The annual consumption index says, how many per cents of the entire heating energy by the KVS WRG can be recovered. It is to be noticed that units with humidification are subject to another calculation!