The hose goes into the empty tank or tray inside (if it's the drain hose like a garden hose). When the hot side of the system goes past there it evaporates the condensation dripping into it. If your talking about the big 4 inch hose, that goes out a window to get rid of the heat from the room.
Hose goes into a bucket or out a window, drained, etc. it's the drain hose for the condensation. alternatively you can use the tank to catch the condensation, which must be emptied periodically.
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