"If you have a smallish house and a centrally located fan, a whole house fan is amazing. The rooms get cooler and the attic gets cooler too. You can shut doors

"If you have a smallish house and a centrally located fan, a whole house fan is amazing. The rooms get cooler and the attic gets cooler too. You can shut doors to make a specific room cool in minutes. Seriously one of the best things you can do to a house imo." I just added a whole house fan to my home in the bay area and it works very well - the temperature drops by as much as 30+ degrees from daytime to night time here. I really appreciate the simplicity of not having AC infrastructure anywhere in my house. However, I have lived in other climates, like Minnesota, where the nighttime temperature does not drop much at all and I am not sure it would be worth the effort. If it was a box to tick for new construction, then sure - but I wouldn't go out of my way to add it to a house after the fact ...