Had an electrician go through the entire place when we first bought the house so we could get safe three-prong outlets in place of the two-prong ungrounded outlets that were originally there. Didn’t do a full rewire because there’s no ceiling access - originally, the only heatsource for the house was electric radiant ceilings, though a couple baseboards were installed at some point after initial construction. The wiring for the sunroom’s A/C is run through a conduit on the outside of the house. I replaced the original through-wall unit shortly after we moved in, and I’ve seen that whole circuit.

What about the interior wall, against what used to be the exterior of the house?