I would suggest an open container of boiling water.  The rising heat from
the water would set up convection currents and really get the cooling going.

> That is great.  And to make your fridge work more efficiently, you
> would have to put some kind of similar fan inside too, to make the
> air move around.  I would like to know what is the best for that too.
> Thanks.
> Zoltan
>