Does a whole house fan replace air conditioning?

Not entirely. It cools efficiently whenever outside air is cooler than inside, typically evenings and nights, which can greatly reduce AC use.

Are whole house fans noisy?

Modern ducted fans like QuietCool mount the motor away from the ceiling grille. The Stealth line is especially quiet.

Whole House Fans

Cool your whole home with evening air for a fraction of what air conditioning costs to run. Shop QuietCool whole house fans, from the whisper-quiet Stealth for small spaces to the Trident Pro 7.0X for large homes, installed by our licensed crew.

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Sizing a Whole House Fan

QuietCool sizes fans at 2 to 3 CFM per square foot of living space:

Stealth Pro 1.5: about 440 to 740 sq ft (ADUs, small homes, single zones).
Trident Pro 5.5X: about 1,700 to 2,500 sq ft.
Trident Pro 7.0X: about 2,300 to 3,500 sq ft.

How a Whole House Fan Works

Open a few windows and turn it on in the evening. The fan pulls cool outside air through the house and exhausts hot air through the attic, cooling both. California's Title 24 energy code includes whole house fans as a prescriptive requirement for new homes in several inland climate zones.

Attic Venting

Each fan needs enough attic exhaust vent area; we calculate and add it during installation. See attic ventilation services.

Whole House Fans FAQ

Does a whole house fan replace air conditioning?: Not entirely. It cools efficiently whenever outside air is cooler than inside, typically evenings and nights, which can greatly reduce AC use.
Are whole house fans noisy?: Modern ducted fans like QuietCool mount the motor away from the ceiling grille. The Stealth line is especially quiet.