On Tue, 17 Jul 2012 12:12:22 -0700 (PDT), don
wrote:

Can anyone think of why all portable air conditioning units come with an air intake hose? I mean why would I hook up air conditioning only to haul in hot outside air?

You need fresh air if you fart a lot.

The hose is needed to exhaust the hot air, same as what is happening
to the part sticking out the window on a regular unit.