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[–]Tom_Bombadil 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Definitely go with the attic fan.

The attic fan should blow the air in the attic to the outside.
There should be a separate vent in the attic that allows air to be drawn from the outside in.
The fan will create negative pressure (it's actually not negative) inside the attic, which will draw in cooler air.

The same applies in your house with window fans. Open windows in separate rooms/areas. Blow the hotter air out of the house (from the hot room, which is typically upstairs or a sun lit room) and let the colder exterior air draw in from the other room.

Blowing cool air into the house is much less effective.

Allow the negative pressure to work for you.