Can anyone ID this old wall unit I found in the house I just bought?

That unit you have is likely a Gibson, but they sold them under a few different lines in that era, so confirming the exact model is tough without a sticker. The chunky design, those specific louvers, and the dial setup are very consistent with mid-70s residential sleeve units. The fiberglass shell and wood-grain look were thier standard aesthetic during that time. Finding an exact manual for a Gibson unit without a badge is basically impossible since they didn't always print model numbers clearly on the exterior cases. However, the general principles for maintanence on those heavy, older units are pretty similar.

Since it's still humming, the compressor itself is prolly still working, which is a huge win. When you get a unit that old, the biggest killers are usually the internal coils or the fan motor bearings, which dry out and seize up. If you decide to keep it, you need to check the electrical connection coming into the sleeve. Because those units draw serious amperage, a worn circuit breaker or a loose connection in the junction box is the easiest way for the thing to spontaneously catch fire. Always make sure the power supply can handle the load before running it for more than an hour. You might need to hire an electrician just for that initial inspection. Regarding parts, you aren't going to find a direct replacement for the entire control panel, but if the physical dials are broken, sometimes those panels were modular. You might find salvaged panels by digging through old residential units or by looking at parts breakdowns for similar unit lines from the same decade. If the internal components are functional, you can always replace the specific failing parts like capacitor modules or blower motor brushes rather than replacing the whole unit. If the electrical system is solid, and the cooling performance is acceptable, keeping it for the nostalgia is totally doable. Just be prepared to spend time tracking down replacement components instead of buying a new box.

That unit's still running is a huge win considering how old it's. My old unit from the 80s had the exact same setup and the blower motor started getting super loud and then started vibrating like crazy. Before it finally seized, I just replaced the motor bearings, which was way cheaper than replacing the whole thing. It makes a bit of a racket, but it kept the whole thing quiet enough in the bedroom, which is the main goal. You'll gotta check those blower bearings first if it starts sounding iffy.

I had a similar unit from the 80s go down last year. The coils inside are the real headache. You can keep the motor running forever, but if those internal fins get clogged with dust or mold, the whole thing just overheats and stops cooling, no matter what. You have to be able to get into that casing to clean the heat exchanger properly. Also, check the mounting bolts where the sleeve meets the wall. Old vibrations often loosen those, which causes rattling and can mess with the airflow. If you decide to keep it, take a look at the condensate drain line. If that's frozen or clogged, the unit will shut down or simply refuse to kick back on. Small but it stops everything when you need it to run through a hot weekend.