The better units use 2 tubes or a coaxial tube so outside air is used to cool the condenser and then that heated air is sent out. There are "spot coolers" that do not have an outside vent but they do not cool a room. They merely discharge cool air to cool a specific place.

Dennis

----- Original Message -----
From: John Bange <jbange@GMAIL.COM>
Date: Friday, July 1, 2005 11:01 am
Subject: Re: Portable Air Conditioner aka hybrid electric vehicle continued

> All the portable units I've seen have had a tube, kinda like a dryer
> vent hose, that you stick out the window (or up into the ceiling
> plenum space) to vent the hot air. They generally "accidentally" leave
> the hose out of the picture in the catalog. No way of getting around
> the 1st law of thermdynamics, though. The heat has to go somewhere,
> and it has to go outside the room for it to work.
>
> > Now, with this all in mind, how do the portable room units work
> then?>
> > They suck in the room air on one end, exhaust the hot air out
> the back,
> > but seem to work pretty good.
> > The condensation is either collected in a drain pan ( which has
> to be
> > dumped every so often ) or is run out a tube to the outside somehow.
> >
> > I wonder how they seem to work pretty good with re-using the hot air
> > that is being blown out the back?
> > Where does it go?
>