Suncourt Equalizer EQ2 Register Booster, Improve Heating and Air Conditioning Efforts IMPROVED AIR CIRCULATION - Have rooms that are too warm or too cold? These over-register fans will aid in boosting airflow to selected areas. EXTEND CURRENT APPLIANCES REACH - Installing these floor or wall register boosters will help your existing furnace or air conditioning unit get to those hard to reach rooms. ENERGY EFFICIENT - Enjoying improved home air quality doesn't have to cost and arm and a leg. Most units operate on an economically low wattage. BOOST AIRFLOW BY 80% - Installation can take seconds over existing floor registers, and the fans automatically switch on and off when airflow is sensed. GREAT FOR ALL SEASONS - Whether you are trying to keep things cold in the summer, or things warm throughout winter with the simple flick of a switch you are bouncing between heat and cool.