Works great as a replacement for my old 13.8kBTU AC in an area with 6 south facing windows. Sealed it up really well with extra weatherstripping around and inside to stop any air leaks. With the wireless app, I can turn it on while we’re driving home so it’s cooled down by the time we arrive. Additional slide in side panels help ensure the louvers maintain their seal and add insulation R value which is good since we leave this installed year round. Eco mode cycles the fan on and off as well as the compressor for additional energy savings. This 15.1kBTU AC draws less current than the old 13.8kBTU unit removed, so more cooling for less power. Very happy with this purchase!