In this video I’m fixing one of the biggest reasons portable ACs feel “meh” in real rooms: the exhaust hose. That hose gets crazy hot and it just radiates heat right back into your space, which makes the AC work harder and cool worse. I demo this on my BLACK+DECKER 14,000 BTU portable AC, but the same idea applies to basically any single-hose portable unit. The easiest, cheapest DIY upgrade is wrapping the exhaust hose with reflective bubble insulation (Reflectix-style). I measured it with a thermal camera: my bare hose was hitting around 130°F, and after wrapping it, it stayed under about 80°F. I also go over a couple quick efficiency wins that matter just as much—sealing the window kit better and using blackout/thermal curtains to cut heat coming in. Finally, I compare a pre-made hose cover versus doing a full wrap so you can pick the option that fits your budget and patience.