I have a small (5000 BTU) window unit in a small shop. It flings the condensate on to the condenser. That helps cool the condenser and the condensate evaporates into the outside air. In 3 years it has never dripped a drop of water anywhere. That's in middle TN where the humidity level is so high you can practically swim thru the air.
I suppose if airflow was restricted the condensate might not efficiently evaporate and could then drip. Additionally, if your evaporator coils freeze up there can be a significant amount of water when the ice begins to melt after the compressor shuts off.
All that may mean absolutely nothing in your installation but I thought I'd just throw out the info for what it's worth.
