When you live in a mid-century home, you choices can be limited when in comes to installing a/c.
The space between the walls, if there is any, can be much smaller plus the homes were constructed genuinely differently back then.
Air conditioning was thought to be an luxurious purchase plus various people just didn’t have the money to put it in! My parents live in one of these condo so I know firsthand how difficult it can be in finding just the right Heating plus Air Conditioning unit. When they met with a local business in village plus explain that they wanted to have some sort of a/c installed he gave them the only opportunity that would work for them, that was a ductless Heating plus Air Conditioning component that could be mounted on the wall plus connected to an exterior component through the wall, however at first my mom wasn’t blissful about the idea because she felt that the component hanging on the wall was too new looking but when she realized it would be easily programmable, low-service, plus could be adjusted with a remote control she decided it would be fine! They have struggled for years with installing window units each Summer plus then having to take them out plus store them over the winter time plus she was genuinely exhausted of having to do that… Plus, the units that they own were old plus not genuinely efficient plus cost them a lot of money to run all summer. This new component would not only be permanent but would be a lot more efficient plus the utility bills would be more manageable. I am cheerful that they took the time to speak with a professional business about their Heating plus Air Conditioning choices plus I guess they made the best one for themselves.