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Good day! The short answer to this is that you can safely run a portable air conditioner without a vent hose, but you should only do it in dehumidifier mode, and it will actually heat up your room. ~Lauren
Sorry, there was a problem. Please try again later.NO. That sends the heated air outside. If you don't use the exhaust hose, you'll be back to square one. Pumping hot air into the house, or wherever it is.
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