DO NOT drain a hole in the unit. Doing so will void your warranty. In instances where there is an excess amount of condensation there is a ¾in opening near the rear of the unit where the water would drain from. The fan is designed to sling water onto the coils to maintain a cool temperature, hence the splashing.
There is water collecting in my window air conditioner and there is no drain hole for the water to drain out of. Can I drill a hole for the excess condensation to drain out?