Copper wire in main power wires is nice but not cost effective. Aluminum wires just need antioxidant grease put on them and retightened and they will work fine. Should be redone every decade or so.
Aluminum in your wall wiring is a disaster, If it was my house I would replace every socket and switch with commercial style clamp connection type and grease them.
Push in style sockets and switches are unreliable. Those with aluminum wiring should be outlawed. I have seen so many burn up and fail.
> Aluminum in your wall wiring is a disaster
Yeah big time. I don’t have that luckily, all copper.
-SB
As a licensed electrician in a mountain community I encountered a bit of aluminum house wiring, especially mobile homes and prefab housing units. In winter I stayed busy adding 8 inch copper pigtails to AL wiring at switches and receptacles and reattaching the wires. At the connection point I would use a large wire nut but filled with inhibitor, what you call 'grease', and sealed with tape. A cheap but workable solution.
Also, as you say, checking high current connectors and tightening. Stayed busy winters.