Is it possible to convince the homeowner that a new 13 SEER unit will work so much better without that precooler than the old Goettl did with the wet pads?
Payson usually hangs out in WOS...don't know if he ever lurks Residential. You may want to reply to one of his threads there.
Building Physics Rule #1: Hot flows to cold.
Building Physics Rule #2: Higher air pressure moves toward lower air pressure
Building Physics Rule #3: Higher moisture concentration moves toward lower moisture concentration.