One thing with dual hose ACs that I would also like to see improved is an extension of the exhaust hose. For me often the hot air will heat up the window which

One thing with dual hose ACs that I would also like to see improved is an extension of the exhaust hose. For me often the hot air will heat up the window which then radiates heat back into the room. We do have 1980s aluminum framed windows, which really makes that problem worse. I did find a big improvement in getting duct insulation and wrapping the exhaust hose in that. For the window portion, I cut out an insulating foam board to mount the hoses, and taped the outside edge with reflecting tape. It's keeping my large bedroom around 76, unless it gets above 95 and will start creeping to low 80s.