I looked it up, and it has an auto evap system (at least the newer ones do) - SOL on that one, nice unit though, I might get one myself. If you goto page 10 of the Q&A section, someone asked how they could intake from an alternate source, LG responded that this unit isn't capable of that. (sorry)

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LG LP0910WNR: 9,000 BTU Portable Air Conditioner with remote | LG USA
Not sure if I did that right, if this needs to be moderated to fix the link, please do so.