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Paul Mathis, head of R&D Viessmann, showing ventilation flow

Video. Is it energy efficient to ventilate your home by opening the window?

Updated: 22/02/2025 - 16:04 GMT+1

In partnership withthe European Commission

Opening a window to ventilate your home may seem harmless, but it can be a big waste of energy. We discovered how mechanical ventilation systems recover heat whilst ventilating, saving 80-90% of energy consumption.

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Is it energy efficient to ventilate your home by opening the window?

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