The Vent-Miser programmable and energy saving vent lets you program your vent to automatically open and close. Shut down the heating or cooling in spare guest rooms; bedrooms during the day; kitchens, dining room and office at bed time to prevent wasted energy. Running independently of your heating and cooling system, the Vent-Miser features a convenient digital module that can be removed for programming and for installing or replacing the battery. Its simple three button programming allows you to set up seven days.