I just sold a house 2 weeks ago that had one of those huge powerful fans built into the ceiling, that opened a trap into the attic and exhausted directly out of the roof. The owner was former Air Force, and it seems to me he had a jet engine in there.

The first time I turned it on to max power, opened the front door, I almost got sucked right out and projected onto space.

Don't have.  Obviously don't use.  

I used to have an old house that had a whole-house fan and boy, do I miss that thing! I loved sleeping to the calming sound of the fan.

And boy, if you burned something on the stove, turn on the fan and the smoke and odor dissipated in seconds!

Condos don't have those so we rely on a/c and a dehumidifier. It's amazing what a difference a small dehumidifier can make.

We have no A/C in our house. We open the windows!

No. We rely upon our air conditioning.

AC only. We don't use fans.

Not now but did in a couple of homes back in New England. They were terrific. We see them on occasion here in SoCal. Not warm enough to need them or AC at the moment.

Amazing the power of strategic fan use, for many years we would have one downstairs window open, and one fan upstairs creating a tunnel of air through the building.

Now we use AC more than we should.

I do not have or use.  My home/condo is small and temps here most of the year are tolerable without heat or AC. 

I don't. Here in Charlotte we have very few days when we are not running either AC or heat. Not many "in-between" days as you call them. Different climate.

My folks house in Southern California had a whole house system which very economically kept a very large two-story house cool.

I am a big fan of whole house fans, but not alot of fan,  fans here in florida.  too much humidity to live with.  

We have some homes built in the 1920's and I have seen those fans in those type of homes.  That's what was used to cool homes back then.

Bonus as Candice A. Donofrio says - space travel included!  I have not seen one of them but it sounds like a moving experience.

We've had whole house fans before and they always worked great. Just about  as good as central AC!

Never had one personally. Sold a home with one and it worked well.

I have a gambrel cape with two air systems...one on each level.... it's very cool in here.... I'm almost finished with the sun today.... it's 90 and humid out....

I've sold one or two homes with them, but mine does not have one.  I have radiant heat barrier paint on one flat roof and a heat barrier installed in my attic, plus an attic fan.  Helps reduce the temperature of the attic considerably, which in turn helps my house stay cooler.  Took some other insulating steps this year during my remodel.  Helping a lot.

AC in our area but some homes have fans.

Ancient thinking even though it still works great. Most people I know rip them out.

I grew up on a house with one and it works !

I have those ole standby tried and true fan (s)...they earn their keep

I can't sleep without them.

I didn't know they were common. I have a friend that just bought a house with one in it. When they turned it on, I was amazed - it was a bit loud and very effective. I'd never seen one before. 

No, but I see them in use at tennis facilities where there is no AC. We have central and small room fans for lighter days.

With the wind we have their is no need for fans, plus they do nothing about the humidity which is more of a problem than the heat.

I have sold homes with them, but do not have one for my own home. 

We do not have one. I occasionally sell  a house that has one. 

Grew up with an attic fan and several of my listings have them. Really work great but not on 95 degree days...it just sucks in the hot air.

Kevin, I've had a roof fan for a couple decades, and it does a great job. I don't have a through the ceiling whole house fan, but I've sold a number of houses in my area with them. AC didn't really take off locally until the early 1970s. So those whole house fans were the thing to have.

We have fans, do not need them, it is barely going to make it to 71 today...no complaints.  A

I have ceiling fans, and run the fan on my furnace, but that's it.

I have a whole house fan and a/c   helps the upstairs all the time.

I have had several listings with whole house fans. I think they are pretty cool. And, yes, I did that on purpose.

my grandmother had one and I think I will put one in my next house, but I don't currently have one.

I have had a whole house fan. Found it great for creating a breeze and getting cooking smells out. I don't think it cooled like C/A does and it's noisy.