Ventilation for all, all the time

Ventilation has two functions : a universal role to assure air renovation and bring fresh air into spaces and the role of energy carrier for heating or cooling. In so far as air is always needed, it was used for both functions. But some dysfunctions occured whenever the energy for comfort overwehelms the ventilation for all, all the time.
Though progress in ventilation knowledge has been extraordinary during the last century, there is a growing concern about it. A revision of the concept of comfort must be done along with a better understanding of what it allows in practice.