2 fans... but have them switched separately.

Agree with nnigrt, two fans would be good for a porch of that size. You could definitely go for ceiling fans with light kits, too, to accomplish two things at once. Take a look at our outdoor ceiling fan selection!

Depending on where you like to sit on the porch and how high the ceiling is, you may be able to get away with a single 60" fan for example. This would free up ceiling real estate for lights outside the swept area of the fan if you preferred not to use a light kit on the fan.

Thanks Airration. Actually, I just ordered a 60", and I am going with LED can lights in lieu of a light kit.

Sorry, thanks Aeratron. Very helpful.