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Do they need a drain?

Yes. The indoor unit on cooling will dehumidify and the resultant water needs to be led away. That is why they are typically mounted on an outside wall. If not, a condensate pump can be used to lift the water to the ceiling to be drained out. But sometimes condensate pumps can be heard when they operate. The outdoor unit when on heating will also produce water. The amount of water produced is similar to a dehumidifier in use


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