Normally, those marine units are water cooled and require a source of fresh
or salt water.
I was looking for a smaller unit but 5000 btu is the minimum  output they
sell. The Panasonic model is a window unit that draws 5.4Amps @ 115VAC, the
marine units have similar power usage numbers. Most campgrounds provide a 15
amp circuit minimum.
The thing that impresses me with the Panasonic window unit is the 10" depth.
Most window units are between 15 and 24" deep.

-----Original Message-----
From: Jay L Snyder [mailto:Jay.L.Snyder@usa.dupont.com]
Sent: Monday, July 31, 2000 13:04
To: Timothy J. Hannink
Cc: vanagon@GERRY.VANAGON.COM
Subject: Re: FW: add A/C

You might want to check out your local marine supply store.  I saw a unit
advertised that was designed to fit into a standard size boat window
(porthole?).  The minimum opening size seemed small, about right for a
Vanagon side window or door window.  It was more than $200, probably more
like $300, but it was specifically designed to start and run with less
amperage draw,  which might be a consideration at campgrounds.  That fact
that it is designed to be taken in and out when the boat is docked might
make it easier for you to mount and store on your camper.  Your unit sounds
like a small house window unit?  Is 5000 btu's  overkill?  How many amps
would this size unit draw?
                                                        Jay