it needs two hoses or it sucks the cold air into the machine before it does any good to the room.well you pay for the silence, for cheap people don't buy an know the diffence, and yes window units are most effeicent. that single cheap plastic hose serves a purpose to exhaust heat and humidity out window. if have 2 hoses is it any better ? just need to use more BTU's to cool with floor type A/C unit
regardless its rating.
old window unit draws 15 amps
portable seen 12 amps draw save alittle on Hydro and noise