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My father did this at the house I grew up in, the basement was usually 60F while the upstairs could be 80-90F.
All he did was shut off the pilot on the furnace and bypass the thermostat turning the blower on during the day,
all of the air into the furnace blower came from the floor of the basement and the returns just dumped into random spots down below (aka most intake air was from the basement not circulated directly from upstairs)
Worked quite well and in even hotter weather there was a window directly in front of the furnace, my father would put a medium sized window air conditioner there and tarp it’s output over to the blower intake and it actually kept the house just as cool as central air.
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