Sent to you by Chris Hunter via Google Reader:
It's starting to cool off in the United States, and that means heating bills are about to rise. Redditor kissfromarose figured out that if you run your ceiling fans clockwise (which is actually reversed) on the low setting, it'll push heat back down and keep it circulating within your home.
The Daily Green, Good Housekeeping's guide to green living, explains how to do this:
Fans today are made with a little switch that changes blade rotation. Counterclockwise produces that pleasant summer breeze we crave. Clockwise makes an updraft that sends the warmer air pooled near the ceiling back into the living space - cutting heating costs by as much as 10%.
Heat accounts for a large portion of your energy bill—the largest portion for most US households. Cutting usage by 10% means significant savings.