A lot of factors go into the design of a ventilation system, from determining how much outdoor air is required for the house with either the ASHRAE 62.2 or BSC-01 standards to choosing which type of ventilation system to use. In green homes, the balanced system is becoming quite popular, but many balanced installations are missing a way to close the hole the allows in outside air during times when the system is not running. Ventilation systems require access to outside air to operate, but when not in operation that hole will undermine their purpose as conditioned air has a place to escape from the house.
Read the full article here: The Ventilation Omission that can Make You Sweat