I think that the theory is supposed to be having cotrollable ventilation, not non-existent ventilation. Calculations exist to calculate the number of air changes that should occur in a room based on size and usage. Ventilation can then be adjusted to optimise this whilst minimising heat loss.
Another option is to make an airtight building with a ventilation system connected to a heat exchanger. The ventilation system needn't be as energy intensive as conventional air conditioning. An example of such a system seems to work well at Hockerton Housing Project.
Buildings in which there is no air flow are bad. They allow moisture to build up, encouraging damp problems which at worst could lead to dry rot. These days, for example, all double glazing should have trickle vents.
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'There are only two ways to live your life, accept things as they are or take responsibility for changing them' Bhagat Singh (even if you don't agree with how he chose to apply this philosophy)
"Just ignore it all" {CT}
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