I like 'em loud too!
This is the one I have yet to install.
Its a radiator fan, reversable, and it really whips up a windstorm!
Draws quite a bit of juice, but the plan is to run it for a few minutes to cool the tear down after a warm day...cool air in, warm air out.
Won't fit in the roof vent, so it'll be in the door or floor
Then after its bearable, we'll use a smaller oscillating fan.
This is of course for the times we don't have an electric hookup...when we have power, the A/C will be employed.
Rob
Waiting for "someday" will leave you on your deathbed wondering why you didn't just rearrange your priorities and enjoy the time you had, instead of waiting for a "better" time to come along...