Portable AC Reversal Adapter

My portable air conditioner sucks. Quite literally. As they all do.

Here's the problem: it takes in air at room temperature. Part of it it blows out back into the room, cooler. The other part is sent out a hose, hotter, out a special panel in the window to the outdoors. But what does that give you? NEGATIVE PRESSURE. Something has to replace the air that was blown out the window. Air is sucked in under doors and through cracks everywhere. And when I'm keeping my room as the one cool sanctuary