​​According to QuietCool:

Enjoy up to 50-90% savings on your A/C usage by turning off your A/C and turning on your QuietCool. And by lowering your A/C, you can extend the life of your HVAC system & your roof.

The science behind a whole house fan lies in its ability to leverage natural ventilation and convection to cool a home efficiently. By drawing cooler outdoor air in through open windows and expelling hot attic air out through the fan, it creates a continuous airflow that lowers indoor temperatures, often by 5-15°F, depending on outdoor conditions. 

This process works on the principle of pressure differential— the fan generates negative pressure inside the home, pulling in fresh air and pushing out heat, which is then vented through the attic, reducing the reliance on mechanical air conditioning and improving energy efficiency.