I run my ceiling fan when I know the heater is running and no one is under it to mix the air before it escapes to the upstairs. Maybe reverse the fan to suck cold air up and displace the hot air above. Another thought, as the air travels through the tube it will conduct temp with the tube and air around the tube. By the time it travels to the end of the tube the temp might be equalized.
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1.47 kw solar, R-40+ attic insulation, 4 layers radiant barrier, solar attic fan, solar mini pool pump
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