What would be the most efficient placements for my fans?

Question

Just inside the door, or just outside the door on the covered porch; which would work better.

Answer 1

Neither.  During the day, you should open windows and doors on the shady side of you house, then place a fan in an open window on the opposite side of the house.  Face the fan so that it blows the air *out* of the house.  What this does is pull the cooler air *inside* your house through the windows and doors that you opened earlier.  To keep cool when you're sleeping at night, open the windows in your bedroom and again place the fan in a window on the other side of the house.  It works great!