The QuietCool QC ES-1500 is the most energy efficient bedroom whole house fan on the market. This fan can help you slash your A/C related electricity costs by up to 90% and pays for itself faster than any other green energy product on the market today. This fan motor and self-contained duct system hangs in the attic and the fan's whisper quiet operation is made possible by QuietCool's patented acoustical ducting that provides six feet of separation between the fan motor-head and the ceiling intake grill inside the house. The result is zero noise vibration thus allowing this system to be used in any bedroom without disturbing the sleepers. With an extremely efficient ECM motor, the QC ES-1500 uses only 65 watts and is great when used as a bedroom fan! It's quiet operation and moderate airflow ensures a peaceful night of sleep. The QC ES-1500 cools and ventilates up to 725 square feet. For vertical wall installations, order vertical wall adapter (part number: VA-1414). Recommended control: IT-30070 Electronic Countdown Timer