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Robert Neville

wrote:

Why would you want to pull the heat out of the ceiling (attic) and
push it down into the room. Reversing the fan only changes where the
air comes down.

It's about equalizing the room temp so that the cold air doesn't pool on the
floor forcing you to overcool the room. Moving air also feels cooler so you may
be able to raise the thermostat setting and save a little.

Reversing the fan is primarily a winter thing to minimized air blowing on people
and making them feel cooler, but still capturing heat at the ceiling and reusing
it.