What Is a Whole House Fan? How Does It Work?

If your home gets very hot in the summer and your energy bills are through the roof, a whole house fan might be just the thing you need to add to your house cooling strategy. Installed in your attic or roof, the fan pulls air into your house through open windows and pushes it out through the attic, cooling your home by moving cool air in and hot air out.

How Does a Whole House Fan Work?        

This fan creates negative pressure, pulling air in through open windows, filling your home with fresh, cool, outdoor air. As the negative pressure in the house begins to build, it creates positive pressure in the attic. When positive pressure builds in the attic, it forces air out the soffits in eaves or other vents, installed in the attic. This creates a cooling effect throughout your home, with the rooms where the windows are open feeling it the most.

What Are the Benefits of a Whole House Fan?

Whole house fans are more energy-efficient than traditional air conditioning units, using significantly less energy than a traditional air conditioner. This makes them environmentally friendly, using little electricity and no refrigerants to cool your home. They provide constant circulation of the air in your home, keeping it fresh and removing odors from cooking, pets, smoke, and household cleaners and if installed properly, they run quietly and last for years.

Whole House Fan vs. Attic Fan: What’s the Difference?

While there are many similarities between a whole house fan and an attic fan with both working to cool spaces in your home, they do serve different purposes. The former draws cool air in through the windows, helping to reduce the temperature of your home significantly, sometimes in as little as one hour, depending on the external temperature. An attic fan’s primary job is removing hot air out of your attic space where it can stagnate and keep the house hot. Both can help lower your energy use and cool your home, but a whole house fan has a more immediate impact on the overall temperature of your home’s rooms.

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