Ventilation system with heat recovery

In short: A ventilation system with heat recovery continuously exchanges used indoor air for fresh outdoor air, transferring the heat of the exhaust air to the incoming supply air. This achieves good air quality without the usual heat losses from opening windows.

In more detail: Especially in well-insulated, airtight new buildings, controlled ventilation is often necessary since natural leaks barely provide air exchange anymore.

In detail

• Heat exchanger: At the core of the system, a heat exchanger passes cold fresh air and warm exhaust air closely past each other in separate ducts without mixing the air streams.
• Efficiency: Modern systems achieve heat recovery rates of over 90 percent, significantly reducing heating costs.
• Air quality: Continuous air exchange reduces CO2 concentration, humidity, and pollutant levels indoors much more effectively than sporadic window ventilation.
• Mould prevention: The constant removal of moist air lowers the risk of mould formation, especially in well-insulated buildings without natural air circulation.
• Filter maintenance: The system’s filters must be changed regularly to maintain air quality and not impair the system’s efficiency.
• Retrofitting: Decentralised single-room units with heat recovery also allow retrofitting in existing buildings without a central ventilation system.
• Noise level: High-quality systems operate almost silently, which is especially important for undisturbed comfort in bedrooms (energieausweis-und-daemmung, richtig-lueften-und-schimmel-vermeiden).