The QuietCool QC ES-5400 Energy Saver Advanced Whole House Fan revolutionizes home ventilation and cooling.Designed for homes up to 2,502 sqft, this fan delivers powerful airflow with 5,003 CFM on high and 2,842 CFM on low. Despite its performance, it remains energy-efficient, using only 497 Watts on high and 88.9 Watts on low, thanks to its ECM motor.Unlike traditional air conditioning, which can be expensive, the QuietCool fan leverages cooler outdoor air to cool your home and attic, reducing energy consumption and potentially saving you 50 to 90% on A/C-related electricity costs.Beyond cooling, this fan enhances indoor air quality by continuously replacing stale indoor air with fresh outdoor air, helping to remove pollutants, allergens, and moisture. Properly sized, the QuietCool can perform a complete air exchange every 3 to 4 minutes, contributing to a healthier living environment.What sets the QC ES-5400 apart is its patented design, featuring an acoustical duct and R5 damper box, ensuring whisper-quiet operation by minimizing noise and vibration. Enjoy peaceful nights with this efficient and quiet whole house fan. Color: Green.