On Friday, June 15, 2018 at 1:23:25 AM UTC-4, danny burstein wrote:
Years ago I used to install Friedrich air conditioners
which were built in two parts. A bunch of competitors
had this option, too.

First was the sleeve, which weighed just a couple of pounds.
This was easy to fasten into place -

Definitely still make them. I bought a 'regular' AC from Wally online and came across quite a few while shopping.