Vent-Miser 91664 Programmable Enery Saving Vent 4-by-10-Inches, White
The Vent-Miser is an easy to install, battery operated vent with timer that can be set to shut unoccupied rooms down and force the air into other parts of the home where the warm or cool air is need.  The Vent-Miser is not a thermostat, it runs independent of your heating and cooling system.  Certified to save on heating and cooling bills. Customer service can be reached at 888-809-3284.