A small room air conditioner is about 5 to 6 thousand BTU.
Automotive air conditioners are normally manufactured to cool about 2000
cubic feet since they are fighting sun heat, heat absorbed by the
vehicle.
I'd rate a 5000 BTU as about 1/5 the capacity of a standard automotive AC
installation.
I use a 5000 BTU as a portable on my Westfalia
http://blackhead.netfirms.com/ac_unit.htm it cools the Westy very good up
to 100 degrees if you're in the shade and at night but falls a little
short if you have to park in the sun.

Stan Wilder
83 Westfalia Air Cooled

On Fri, 3 Aug 2001 10:04:39 -0700 Mark Drillock <drillock@EARTHLINK.NET>
writes:
> Anybody know offhand what the BTU rating is of the factory A/C in the
> Vanagon? If so, please give model year and source of the info if
> available. I am thinking that 6000 BTU is only a small fraction of
> the
> factory A/C capacity.
>
>
> Mark

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