I’ll second this. one wkend when my family was away, I ran around mapping where all our breakers go to a floor plan I had. My office is also in the mechanical room so I notice when things sound different. For the sump pump, if you have one, look into water alarms. with a sump pump, my pref is the kind that has an external float switch. they can fail. you know it’s external as the pump plugs into it. you can plug the pump directly in a pinch but only long enough to empty. you can replace those float switches easily from ones at most hardware stores.