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RE: Passive Houses - what makes them passive?
I live in a modern Epc 0.4 house. The vents above de windows: Should they be closed or open in cold season? I guess we need some kind of ventilation to not suffocate. But how much?
The vents are usually used in newer buildings with tighter windows but with traditional ventilation. I assume you have ventilation chimneys in bathrooms and kitchen. They need air coming from living rooms (from vents) to work. So you should have them opened at least partially (I hope you have the regulated vents).