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to bring the heat down from my 14' cieling area where the electric heater hot air finally winds up i use a slow turning cieling fan that is switched with my lights and an 8" round duct that goes from cieling height to floor with a fan motor in it that is on a timer and every 15min of every hour it circulates the hot air back down to the ground level. this creates a 1* difference in temperature from the cieling area to the ground area. i even use the fan in the round duct when i dont have the heat on and it moves the warm air from the solar radiation back down.. my son actually declared that 8" round duct with the fan in it as one of my best ideas.
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