All but one major room is part of a single path through home, from a window on one end to a window on the other. In the evening I want to bring in cooler outside air as efficiently as possible. If there is no breeze outside, is it faster to
- close all windows except the two endpoints, setting up the box fan (which fits well in the window) to push air in or pull it out at one end.
- open all the windows, and put the fan somewhere, without knowing exactly what the path of airflow from it will be.
The first method takes no advantage of whatever minimal passive airflow would occur with all windows open wide.
The second method doesn't make as good use of the fan, because it may end up cycling the air immediately around it over and over instead of reaching all areas of the house.
If passive circulation were truly nonexistent, then maximizing the fan's efficiency would be the way to go. Does it seem plausible that passive circulation could indeed be low enough for that to be the case?