Whole house fans or one big shop fan?

So its super stuffy here at my house. I have tons of windows but surprisingly not many of them open. I need to remedy this. I put a "whole house" fan up in the master suite and it does its job surprisingly well for 500sqf, does not dent the airflow in the rest of the house though. Master will get 92-93 on a hot day and is sub 70 by the time we go to bed at night if I run it when I get home after three hours. ~450 watts at 0.11c a KWH so its darn cheap as well.

Is there any way to hook the ducting that I have for the AC to a whole house fan with a filter. I would have to find or build some sort of external vent so I can pull the outside air in. The one I installed we had to put a vent through the roof and some pretty large vents in the wall.

Or should I just go out and grab a monster 30 inch industrial that I have back a the shop, drop it in front of one of the few windows that do open, and use it to flush the stale air out of the house.

The 30 inch fan is free the whole house based on what I paid for the parts on the bedroom is going to run 3500-3700 in parts to get the CFM I need plus what even I need to adapt it to the AC ducting that we have and filters. The 30 is ugly as sin though I wish I could find a way to mate it with some ducting to a window and some filters.

Doesn't your AC have a fan that you can turn on independent of running the AC. That's what we do. We have hot air heat and AC with ducts in every room. We run the fan continuously when it is not hot enough for the AC.

The house I grew up in had an attached green house. The greenhouse was not very large, but is had a 3ft diameter belt driven fan, not sure of the horse rating.

On stuffy nights, we would open the door to the green house and close the supply vents to the green house. You would open all of the windows 4-6in in the bedrooms and it would draw strong breeze through the whole house.

House was 2 stories, bedrooms upstairs, green house ground floor. It was a life saver. House was on a boiler with radiators, no AC or air ducts.

Hal wrote: Doesn't your AC have a fan that you can turn on independent of running the AC. That's what we do. We have hot air heat and AC with ducts in every room. We run the fan continuously when it is not hot enough for the AC.

They pull from inside the house and then recirculate the air after cooling it. If they pulled from outside this would be a no brain'r to wire up.

You would need a louver and some ductwork. A damper to close off the house return and a damper to let in ouside air. The air would relieve out through your open windows. The louver could be instead a wall cap or a gooseneck.

Something like this but manual hand operated dampers instead of the economizer controls.