In your case, your current AC units are spending a fair amount of time
and energy ($$) pulling water OUT of the air.

Are you saying that the act of drawing the moisture out of the air uses more
energy? I was under the assumption that dehumidifying the air was just a
nice byproduct of running your AC unit.

If I understand what you are saying, a room at 90 deg will be cooled quicker
and easier by an AC unit if the humidity in that room is low than it would
if the humidity was high?