Do they even make dual inverters for less than 8,000 BTU?

Hi!

I made a post in r/hvacadvice trying to figure out what size window AC unit I should get for my 100yo apartment in NE Ohio. I've pretty well decided on a 5,000 BTU for the bedroom, and 8,000 BTU for the living area, and I had really been looking for dual inverters because I had heard they can vary how much they run and draw less power than they say they will, and basically my whole apartment is on a single 15A circuit (details here) But I can't seem to find a dual inverter smaller than 8,000 BTU. Do they not exist? Or are my articles just outdated?