Just about every apartment has those through-the-wall type air conditioning units. The company I work for used one in our first server room. Before and after that I never saw anything similar, but with my first trip to Romania the apartment I rented then had an almost identical unit. They still don't seem to be popular in the US, but I tell you they work well.

Yes, Bucharest.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris