Building envelopes are becoming more and more airtight and the air is getting dirtier. The fresh air and healthy indoor climate are becoming increasingly more important. The treated air (Co2 and fine dust filter) can be dehumidified and humidified by ventilation, without opening the window through a heat exchanger. Therefore, heat energy won’t be lost.

The choice and design of the ventilation system is made after an analysis of the object in consideration of the available heat and cooling energy. The ventilation system also includes efficient regulation and possibly close cooperation with the design planer (building management system) for integration into a higher-level control system.

When determining the correct ventilation systems, the costs of different systems or installation types are compared in an economic efficiency calculation. Investment, operating and maintenance cost are the three key figures.