I think this is a good idea but I don’t think it’ll be workable for my space unless the entire structure comes down.

How do you mean, raise the floor? I believe the concrete patio floor was poured as part of the foundation of the house.

Most of the circuits were wired with 12/3 already but with the ground wire not hooked up to anything. The electrician replaced the service panel, hooked up the grounds and installed new three-prong outlets. The circuits that were wired with 12/2 got GFCI outlets.

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?

Yeah, when we first moved in the plan was to put in an alternative heat source so we could use it as combination exercise / office space. I’d really like to be able to set it up that way - I like the view the sunroom gives but I really need more year-round floor space so I’d be willing to lose the sunroom functionality completely if I had to