Turn on all the lights in each room. Next turn on various appliances, even hair dryers in the bathroom, and watch the lights for flickering. A slight flicker isn’t unusual, but a permanent dimming is a sign of an overloaded system. The same is true if an appliance repeatedly causes a circuit to trip.
If a switch doesn’t appear to control anything when you flip it on, it can be a sign of an old disconnected load or circuit. A do-it-yourselfer might leave the switch in place, but an electrician would remove it and cover the box with a blank cover plate. You want to check for signs that work was done properly, not slipshod.
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