
Originally Posted by
Jun aka Pekto
The dual-hose portable air conditioner generally uses more electricity than the single-hose one because the input air from the outside requires more cooling power. For small bedrooms like my den, I'm better off with a single-hose unit because the seeping air comes under the (closed) door from the hallway which is still much cooler than the outside air. The single-hose unit usually comes with adjustable boards and fittings so that gaps around the window are minimized.
I would consider the dual-hose unit if I'm cooling a living room or kitchen. But, we bought a window unit instead.