Window AC draw air in the sides, to dump the heat out the
back. If you put them in a metal sleeve, they stop working.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"mm" wrote in message
...


Window ACs work better when you don't waste a window on
them. Most
come with optional cases meant for going through a wall, but
you might
not need even that.