Back in the 70's and early 80's...
My folks had a light bulb fixture plugged into a wall socket. The bulb in the fixture was bright red. The fixture had a temperature sensor in it that caused the lamp to come on if temp went below 40 degrees (I think). It hung in the front window. All the neighbors on the street had their phone number and knew where the hidden key was kept.
If the light went on, they could go inside, make sure the furnace was ok, check the outside tank for oil, and if the heater could not be reset or restarted, they would call Dad and let him know.
Only happened once or twice, I know once because the oil tank ran dry. Never any damage thanks to good neighbors watching out for neighbors. they can sure help that damage like OP spoke of does not happen,.
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