Room to Room Fan Helps Cut Down on Your Energy Bill

Heating and cooling costs can be a real drain on the bank account, especially when money is tight. This simple $30 door fan helps push warm or cool air into neighboring rooms.

Obviously, it's just a fan—but the fact that it can be installed in the corner of a doorframe means that it will be out of the way—unless you are tall with poor eyesight and mistake it for a really thick cobweb. [Improvements Catalog via Red Ferret]