The water that drains out of the drip pan of an air conditioner typically goes to one of two places, depending on the type of air conditioning system:
Central Air Conditioning Systems: In central air conditioning systems, the water that drips from the drip pan is collected in a condensate drain line. This drain line is usually a PVC pipe that runs from the indoor evaporator coil to the outside of the building or to a nearby drain. The condensate drain line is designed to carry the water away from the air handler and safely dispose of it outside or in a suitable drainage system. In some cases, the condensate drain line may be connected to a condensate pump if the air handler is located below the level of the drainage point.
Window or Portable Air Conditioners: For window or portable air conditioners, the water that drips from the unit is collected in a built-in condensate tank or reservoir. These units are designed to be self-contained, so the water remains in the reservoir until it needs to be emptied manually. When the reservoir becomes full, the air conditioner will usually have an indicator or alarm to alert you to empty it. Some portable air conditioners also have an option to attach a drain hose, allowing the water to be continuously drained to a nearby floor drain or bucket.
Regardless of the type of air conditioner you have, it's essential to ensure that the condensate drain line or reservoir is kept clean and free from blockages. A clogged drain line can lead to water backup, potential water damage, and even affect the performance of your air conditioning system. Regular maintenance and cleaning of the drainage system are recommended to keep your air conditioner running efficiently and to prevent any water-related issues.