About those portables..........some only have 1 hose (and not a hose in a hose, concentric, etc) rather than both an inlet hose and outlet hose. The single hose ones are TERRIBLY inefficient, because they are exhausting hot condenser air, and this means they are DRAWING IN more hot air from outdoors through cracks and leaks in the building.
If you can always get a portable with TWO hose setup.
