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In order to save energy, the state prescribes extremely airtight construction for apartments and residential buildings. Controlled ventilation systems with heat recovery are the ideal solution to ensure a sufficient supply of fresh air in your apartment or house. This prevents health hazards and damage to the building caused by moisture and mold. Controlled ventilation with heat recovery also allows a considerable amount of valuable heating energy to be recovered. Thanks to our many years of experience in the construction of energy-efficient buildings, we have the necessary know-how for the design, planning, installation and maintenance of controlled ventilation systems, taking into account the high standards of hygiene and user-friendliness, both in a new building and in the energy-efficient renovation of an existing building.