“Do the hoses need to be attached to the window or sliding door in order for the heater to work?”

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• Yes, or else you'll be blowing cold air into the room--robbing Peter to pay Paul--it's a heat pump.

  Answered by Steve 1 year ago

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• Not for using just the heater, No. ........... But for the A.C., Yes.

  Answered by Rock1 1 year ago

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