A dual hose unit works by taking in air from the outside through one of its hoses (intake), using that air to cool the unit - and then expelling that hot air through the exhaust hose. A Dual-hose setup won't create negative pressure inside the room and therefore wont draw in air from adjacent spaces to the area that is being cooled. Initial cool down of the area is quicker than single hose and if the outside conditions are temperate, the compressor cools down faster which results in colder front air output.
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