[spdustin]

In some zones, whole-house ventilation fans (which are installed in the ceiling below the attic) are excellent and efficient ways to cool and/or ventilate a house quickly—by exhausting the air in the living area of the house up and out through the passive vents in the attic. Open some windows, turn on the whole-house fan, and the air in the house is fully exchanged with fresh air from outside very quickly.

It helps to reduce stale odors, bring in fresh air, reduce indoor allergens...also handy when you accidentally burn something in the oven. :)

[mark212]

I think the key there is to open the windows at a time when it’s cooler outside. Without sufficient openings to pull air in, the pressure differential is inefficient