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(Una) wrote:

A key point that seems to need underlining here is that there
are two elements. The air exhaust (via fan), and air *intake*.
You can put in a humongous monster of a fan but if you don't
open enough windows and interior doors throughout the house,
the fan cannot get enough house air to exchange hence cannot
cool the house. This is especially true in a newer, "buttoned
up" heating/AC efficient house.

And in this situation, you run the risk of back venting furnaces, water heaters
and any other vented devices in the house, which is a very bad thing.