Gets done directly on PTACS and window shakers all the time Rich they
sling the condensate at the condenser coil. It is being done
commercially treating the condenser air with a wet cell media.

Venting attics is a northern concept to stop ice dams. In the SE and
the SW I think a sealed attic with insulation on the under side of the
pitch and any gable walls above ceiling plane is the way to go. If you
air condition the attic space there would be no real overall gain on
the cooling load. Subtract the heat down though the ceiling plane and
in the situation here, heat gains on ductwork and equipment in the
attic space and the cooling in the attic subtracts from what would have
been needed in the space below.

I am now in a year round cooling environment, hot and humid. They vent
attics here because it 'flushes' out the heat. It is pretty difficult
to seal the ceiling plane here so while flushing out heat, you are also
pumping a lot of humidity into the attic due to the nature of the
outside air. So the humid air can short circuit insulation and enter
the home, whenever the home is depressurized. Nick mentioned exhausting
air to the attic put it could just come right back in.

So my gut reaction to using evap cooling in an attic is 'thumbs down'
don't want to add moisture. You could take take outside air, cool it
right down with evap cooling put it through an HRV type HX, run attic
air through the other could work, cost an arm and a leg tho.

Seen a hydronic fan coil advertised for attics, it capitalizes on the
fact that an attic is a solar collector, fan coil cools the attic and
the heat picked up in the attic gets dumped into a swimming pool. Nice
two birds with one shot, but swimming pools are a luxury.

If you don't have a pool and try a couple fan coils I wonder if the
energy of two fans gets you anywhere.