A Monoblock AC Is Only as Good as Its Window Seal

I moved into a top-floor 1970s apartment in one of the warmest corners of Germany, work from home, and needed the office to stay below thinking is hard now . A single-hose portable AC is a thermodynamically compromised machine, but most of what makes it bad happens at the window. Here is the personal story, a short detour into why these units leak, and the cheap XPS panel I cut to fix the part…