Was talking to my relatives back east today. They are part of the 2,000,000 people with no electricity in MO and IL. 40 years ago when I lived there I had a gas furnace with a 2 stage thermostat that was thermocouple powered. It had instructions on how to operate the furnace with no electric power in an emergency. As I remember, you would remove the cover to the blower section, and leave the door to the basement open. The furnace would function as an old style gravity hot air gas unit. It only turned on part of the burner, but the high temp limit and thermostat still worked. Was wondering if any furnaces like that are available now? Tried googling every description I can think of and can't find anything.
Al