Window Air Conditioner No Drain Hole. When the water builds up it is distributed by the fan sling and thrown up against the condenser. Some have a drain hole, but the hole is not in the bottom but rather the side, up a prescribed distance from the bottom, to allow water to puddle up just the correct amount for the proper operation of the slinger fan, in the unit, then drain out the side hole to maintain level.

Room temperature air into the unit and moves over the cold refrigerant coils. Window air conditioners function differently from other air conditioners. Leveling the air conditioner with a slightly backward tilt may also be necessary when you see your window air conditioner not draining water.