There are certain times a year that a whole house fan won’t do you much good, but if you live in a place where the days are warm and the overnight low temperatures drop into the 60s or below at some point in the year
We recently bought a 1960s home with no air conditioning (A/C). In northern Michigan, it’s not as uncommon as you might think to have a house without A/C.
The original whole house fan design was a metal box that sat between your ceiling joists that separate your living space from your attic. The metal box contained a fan or two that were situated just above a hole cut in your celing, which was covered by a decorative grille.
Depending on where you live, a whole house fan will make sense to use at certain times a year. In northern climates, you’ll likely use it all summer long, and perhaps in the late spring and early fall.