Re: back window AC unit
When I mounted my AC, I used 1/2 square steel tube to support the right and left sides, tying into the structure, then screwed the side flanges of the AC unit to the tubes. I made sheets to fill the opening out of aluminum, installed styrofoam insulation and finished up my beadboard interior wall. I ran the 120V cord under the beadboard to an outlet then broke it out to plug it in. My AC has a small breaker box at the plug, and I didnt want to cut it out and hardwire into the 120V circuit.