A whole house fan provide a way to quickly cool your home after a hot day.
It works when the air outside is cooler than the air inside, which occurs in later afternoon and early evening.
A whole house fan is a large powerful fan that install in a central part of the your home (typically a hallway) and blows from the house into the attic.
As the whole house fan blows, the pressure in the attic increases and the pressure in the house decreases.
The hot air in the attic then vents through roof and other attic vents, while the air from the house is replaced with a cool breeze that comes in through your windows.
To allow them to work, you just crack a window somewhere before you turn your whole house fan on.
The next article describes how to size a whole house fan for your home.
This article is part of a series on how to cool your home without air conditioning.
And speaking of a whole house fan for your home ….. we would love to install one for you when you live in or near Palo Alto.