A Passivhaus should be designed to allow for similar ventilation as older houses: http://en.wikipedia.org/wiki/Passive_house#Ventilation http://en.wikipedia.org

A Passivhaus should be designed to allow for similar ventilation as older houses: http://en.wikipedia.org/wiki/Passive_house#Ventilation http://en.wikipedia.org/wiki/Passive_house#Ventilation I haven't actually examined one in person, so I don't know how well it's been executed in practice, but thought was given to this issue.