An Ankoù
Landlord.
You're right. The unit blows chilled air out of the front and the heated air has to be ducted out of the room, ie, through an open window. Which, unless you can find a way of blocking up the rest of the opening, rather defeats the purpose. It's not difficult, though, with a couple of towels or similar. The water condenses in a container inside the unit, which has to be emptied every now and then.The problem with these stand alone air con units is they have an outlet pipe similar to a tumble Drier so if it's not properly installed you need to open a window to let the water out.
Having said that, it only gets used for about 6 or 7 days in a year when the temperature approaches 40 for days on end and doesn't drop much at night.
I snapped up an Amazon Warehouse Deal a couple of years ago thinking it might allow me to brew more summer beer. The beer's never seen it and now I've discovered kveik!