I ordered a 14K BTU from Amazon and got one with the highest ratings. I am in my camper right now but the portable A/C unit is stowed so I can't see the brand. It has one exhaust that I exhaust out the window. I built a plywood frame that sits in the window and can be removed and put the hose bracket provided in that plywood frame. I cut the frame with a jigsaw and painted it. I run an extension cord through the top of the frame to the 15/20V outlet on a campground pedestal. Combined with the 15K BTU Brisk II A/C on the roof keeps my camper cool during triple digit temps. Also fixed A/C duct sealing, sealing inside the lower Dometic A/C and tinted all my windows as that is where much of the summer heat gets in the camper.

I understand you may have added a portable AC unit. Do you have a recommendation?