A common feature was to let the interior fan blades sit above a pool of condensate and flick water over the coil to aide in cooling.

This is not appropriate for humid weather.

Where I lived as a teenager, we had a window unit that couldn’t easily be removed. Second story window, required a ladder. After multiple years, and some issues, we took it out, I disassembled it, and found ALL of the styrofoam, fan, and housings, to be coverered in mold 😬 Dry, dark, crusty. It was a whole world in there…