On Tue, 04 Jul 2006 21:46:43 GMT, Carol
wrote:

In article ,
udarrell wrote:

KEEP it "CLOSED," you do not want outside air entering into the cooling
coil!

Thanks for that info! I've wondered for so long which it should be.

Crazy question...why do they even give a choice? What's the purpose of
using outside hot air?

It's usually hard to open the window when the ac is mounted in it.
Open is for fresh air. Same as in the car.