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Ceiling fans usually have larger motors than portable fans and unless there is enough ventilation to allow the heat released by the motor itself to escape, heat

Ceiling fans usually have larger motors than portable fans and unless there is enough ventilation to allow the heat released by the motor itself to escape, heat will gradually build up in a room with closed doors and windows, just from the heat of the motor alone. Fans are really best only while you are feeling the breeze directly, and for the best effect ceiling fans are more ideal for outdoor use because their excess heat can be more than you expect. After running it for a while, turn it off, wait for it to stop spinning, and feel how hot the motor is. Yup. Not always a problem if you keep the windows open, or are willing to pay for the A/C to remove this excess heat.

schiffern 2y ago
> Fans are really best only while you are feeling the breeze directly Indeed! I use them thusly. This is kinda the genius of those Japanese fan-jackets. It's essentially a fan connected to a flexible person-shaped "shroud" (AKA a jacket) which makes sure all the airflow is actually directed over a person's skin. I was gonna invent something to solve exactly that problem you raise, only to realize Japanese inventors beat me to it. :-) P.S. The biggest noticeable effect of having the fan on during the day was to accelerate heat transfer through the hot gable ceiling to the indoor air. Predictably, forced fluid movement accelerates heat transfer, so the "heat battery" of stored up nighttime coldness would rapidly deplete in only an hour or so. During cloudy weather this effect was a lot less, because the ceiling wasn't baking hot.