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What is the return on investment for a whole house fan?

A whole house fan can be a cost-effective solution for reducing energy consumption and maintaining a comfortable indoor environment during the warmer months. However, homeowners may be hesitant to invest without knowing the potential return on investment for a whole house fan. The ROI for a whole house fan can vary depending on a number of factors, including the cost of the fan and installation, the energy savings it can provide, and the climate of the area. Learn more about whole house fan savings below.

A whole house fan can provide a significant energy cost savings during the warmer months of the year, by reducing the need for air conditioning. The energy savings can be significant, especially in areas where air conditioning is used frequently. The initial cost of a whole house fan can range from a few hundred dollars to a few thousand dollars, depending on the size and features of the fan.

Assuming an average cost of $2,400 for the fan and installation, and energy savings of $400 per year, the return on investment for a whole house fan would be about 17% per year. This means that it would take approximately six years for the energy savings to pay for the cost of the fan and installation. However, the ROI could be higher or lower depending on the specific circumstances.

It’s important to note that ROI is just one factor to consider when deciding whether to install a whole house fan. Other factors to consider include the climate of the area, the size of the home, and the homeowner’s energy usage patterns. Additionally, a whole house fan may not be effective in humid or climates that remain hot at night, so it’s important to consider whether it is a good fit for the specific location.

A decorative image showing a house made of $100 bills.

The difference between a whole house attic fan and an attic fan

Attic exhaust fans are a common solution for reducing heat buildup in attics, particularly during hot summer months. They are designed to cool the attic space and improve air circulation. There are two main types of attic fans – the traditional attic fan and the whole house attic fan. While both types of fans serve a similar purpose, there are some key differences between them that are important to consider when deciding which type of fan is best for your home. In this article, we’ll discuss the difference between attic exhaust fans vs whole house fans.

A regular attic exhaust fan is a standalone unit that is installed in the attic and is used to ventilate that space specifically. It helps to remove hot air and moisture from the attic, which can help to prevent damage to the roof and insulation, as well as reduce the overall temperature of the attic.

On the other hand, a whole house attic fan is installed in the ceiling and vents into the attic.  It is designed to regulate the temperature in the entire house, not just the attic. When the fan is turned on and the windows are open, it pulls cool fresh air from outside and forces the hot air from the interior of the house by pushing it outside through the attic and attic vents. This can help to reduce the overall temperature in the house and reduce the load on air conditioning systems, leading to energy savings.

In conclusion, understanding the difference between a whole house attic fan and an attic fan is important in determining the most appropriate solution for your home. A traditional attic fan is good for cooling the attic space only and improving air circulation, while a whole house attic fan is designed to cool both the attic and living space and is most effective in dry climates that have cool evening, night or morning temperatures. When deciding which type of fan to install, consider your climate, the size of your attic, and your cooling needs.

How To Cool Your Home With A Whole House Fan

A whole house fan is a cost-effective way to cool your home and improve indoor air quality. Here’s how to use an attic fan to cool your house:

  1. Open windows: When the temperature outside is cooler than inside, open windows in the rooms you want to cool.
  2. Run the fan: Turn on the whole house fan. The fan will pull cool air in through open windows and exhaust hot air out of the living space and attic.
  3. Keep indoor doors open: Keep doors open between rooms to allow cool air to circulate.
  4. Close windows and doors when you turn off the fan: Be sure to close the windows and turn off the fan before the temperature outside starts to rise. This will allow the home to stay cool longer.
  5. Repeat as needed: Repeat the process as needed to maintain a comfortable temperature in your home.

Note: It’s best to use a whole house fan when temperatures outside are at least 10 degrees cooler than inside, typically in the early morning, evening or at night.

To learn more about how whole house fans work see our explainer on how whole house fans work.

What Is A Whole House Fan Used For?

A whole house fan is a type of ventilation system that is used to cool a home by exchanging indoor air with outdoor air. The fan is typically installed in the attic or upper level of a home and is designed to pull hot, stale air out of the living spaces and replace it with cool, fresh air from outside.

The main purpose of a whole house fan is to provide an energy-efficient alternative to air conditioning, especially during the cooler months of the year when the temperature outside is pleasant. The fan can be used to cool the entire home or just certain rooms, and it can be operated in conjunction with other cooling systems, such as a central air conditioner or a window air conditioner.

By removing hot air from the home and replacing it with cool air, a whole house fan can help reduce the temperature inside the home, improve indoor air quality, and reduce the need for artificial cooling. This can result in lower energy bills and a more comfortable indoor environment.

A decorative photo of a couple sitting on their sofa trying to cool down in front of a portable fan. They need a whole house fan!

How Much Does It Cost To Install A Whole House Fan?

The whole house installation costs can vary greatly depending on the size of your home, the type of fan you choose and the complexity of the installation. On average, the cost of a whole house fan installation can range anywhere from $600 to $1000 or more. Factors that can influence the cost of the installation include the cost of the fan itself, the cost of any necessary electrical work and the cost of any additional ventilation required


It’s recommended to get a quote from a licensed contractor that has experience installing whole house fans. Keep in mind that investing in a quality whole house fan and professional installation can provide long-term energy savings and improved indoor air quality, so it’s worth considering the investment as part of your overall home improvement plan.

A photo of a CentricAir ducted whole house fan installed in an attic, showing how the fan is attached to the attic framing, and that the fan itself is at the end of a duct and around a corner to so that it is very quiet.

Are Whole House Fans Worth The Money?

Whether a whole house fan is worth the money depends on several factors, including:

Climate

Whole house fans are more effective in climates that have milder temperatures at night. If you live in a hot and humid area where temperatures remain high even at night, a whole house fan may not be as effective.

Energy Costs

A whole house fan can be a cost-effective way to cool your home if you live in a region with cool evening or nighttime temperatures. Whole house fans can actually save you up to 90% on your electricity bill. Pacific Gas & Electric Co. (PG&E) claims that whole house fans use up to 90% less energy air conditioners.

Home Insulation

If your home is poorly insulated, a whole house fan may be an effective way to cool the home.  A hot attic that is poorly insulated, can cause heat to migrate throughout the entire house. In warm climates, where the sun constantly beams down on to the roof the attic quickly fills up with hot air and pushes down into the house and as a result raises the temperature. A whole house fan brings in cool fresh air from outside and pushes out the hot stale air that’s trapped inside the home and attic.

Ultimately, whether a whole house fan is worth the money depends on your specific needs and circumstances. If you’re interested in purchasing a whole house fan, it’s a good idea to do some research and speak with an expert to determine whether it’s the right choice for you.

Is an Attic Fan Good or Bad?

Are attic fans good or bad? It depends on the specific situation and purpose. Attic fans can have both benefits and drawbacks.

Benefits of an Attic Fan

Attic fans can help reduce heat buildup in the attic during hot weather, which can help lower the temperature inside your home and reduce your air conditioning usage.

Attic fans can also help reduce moisture buildup in the attic, which can help prevent mold and mildew growth.

Drawbacks

Some attic fans can be noisy and disruptive, especially if they are located close to living spaces. CentricAir attic fans are they quietest in the industry. They are acoustically designed and precision balanced making for an ultra quiet operation.

Some attic fans can also increase your energy bills, especially if they are used frequently or left on for long periods of time. CentricAir attic fans are extremely energy efficient and use just 1.5 amps and come with a 15 year fan motor warranty.

Overall, a quality attic fan can be good if properly installed and used in a way that balances the benefits and drawbacks for your specific situation.

When Do You Use A Whole House Fan?

A whole house fan is typically used in the evening or early morning when outdoor temperatures are at least 10 degrees cooler than indoor temperatures. The fan is used to exhaust hot, stale air from the living space and attic, and draw in cool, fresh air, providing a natural and efficient means of cooling the home. This can be an energy-saving alternative to air conditioning, especially in regions of the country with cool evening, nighttime or morning temperatures. However, it’s important to use the whole house fan only when windows or doors are open to ensure proper air flow and to prevent negative air pressure in the home.

How Does a Whole House Fan Work?

A whole house fan works by drawing cool outside air into the home through open windows and expelling hot, stale indoor air through the attic and roof vents.

The fan is typically installed in the attic and is connected to a vent system that runs through the attic and into the rooms of the house. When the fan is turned on, it pulls cool air into the home through open windows and pushes hot, stale air out through the attic vents.

This creates a natural “stack effect” that cools the house and improves indoor air quality. Whole house fans are typically used in the evening or early morning when outdoor temperatures are cooler than indoor temperatures, which makes it more efficient and cheaper to cool the house. Whole house fan can be operated by switch or remote control.

Visit our detailed page about how whole house fans work.

A diagram showing that whole house fans pull fresh air in through a home's windows and push the old air out through the attic, cooling the home and attic at the same time.

Benefits of a Whole House Fan

Energy efficiency

Whole house fans use significantly less energy than air conditioning systems, making them a cost-effective option for cooling your home.

Improved indoor air quality

The quality of the air in your home dramatically affects your health. Whole house fans can be used to ventilate the home, bringing in fresh outdoor air and expelling stale indoor air.

Increased comfort

Whole house fans can quickly cool down a home when the temperatures outside are at least 10 degrees cooler than inside and it creates a refreshing breeze.

Improved sleep

Whole house fans can help create a cooler and more comfortable sleeping environment.

Low maintenance

Whole house fans require minimal maintenance, typically only needing to be cleaned periodically.