Way better than the first one I got which was the single hose 10,000 btu newair unit that takes forever to cool my room. The whynter dual hose cools my room in less than 30 minutes. There is no negative pressure being dual hose for you can feel the cold air blowing out underneath the door of the room. Quite and hard to tell from the sound if the compressor was on but definitely cold air coming out the unit. Highly recommend this product and I know its a bit pricy but its well worth it.