The concern is at the connection points, not the wire running through the walls. Loose or corroded terminations at receptacles, switches, and the panel generate heat over time. This is why aluminum wiring deserves professional attention even when nothing seems wrong today.
Accepted remediation methods include approved connectors that pigtail copper onto the aluminum at each device, or other manufacturer-approved repairs performed by a licensed electrician. Simply replacing devices with aluminum-rated terminals is also part of some solutions.
If your inspection suggests aluminum wiring, have an electrician assess the whole system before closing. Insurance carriers sometimes ask about aluminum wiring, so documented, professionally completed remediation can matter for coverage as well as safety.
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