Quick answer
An attic fan, also called a powered attic ventilator, is an electric or solar-powered exhaust fan that pulls hot air out of the attic and releases it outside. It cools the attic, not the living space, and is not the same as a whole house fan.
- The effect on the cooling bill is small and not guaranteed.
- In a poorly sealed attic, a fan can pull cooled air out of the house.
- A fan can backdraft gas appliances and bring carbon monoxide indoors, so have them checked first.
An attic fan is one way to ventilate a hot attic, but not every home needs one. ENERGY STAR advises following its air sealing and insulation strategies and making sure the attic is well ventilated using passive vents and natural air flow.
What is an attic fan?
An attic fan, also called a powered attic ventilator, is an electric or solar-powered exhaust fan that pulls hot air out of the attic and releases it outside. It cools the attic, not the living space, and it is not the same thing as a whole house fan. The effect on the cooling bill is small and not guaranteed. A Florida Solar Energy Center test of solar attic fans measured about a 6% drop in air conditioner use, and ENERGY STAR warns that a fan in a poorly sealed attic can pull cooled air out of the house and raise the summer utility bill.
Keep reading to learn about the common types of attic fans, what they do, who they suit, and what to check for safety before installing one.
What Is an Attic Fan? (Easy Definitions)
An attic fan is also called a powered attic ventilator or power attic vent. The names overlap and are often mixed up with whole house fans.
The sections below go through the terms a homeowner is most likely to see.
Types of Attic Fans
Attic fans are grouped by where they mount (gable or roof), how they are powered (wired, plug-in or solar) and how they are controlled. The list below also covers a few related terms, including the whole house fan, which is a different product.
Types of attic fans:
- Whole house fan (a different product, often confused with an attic fan)
- Gable mount attic fan
- Roof-mounted attic fan
- Electric attic fan
- Plug-in attic fan
- Solar attic fan
- Garage attic fan
- Smart attic fan
- Old style attic fan
- Attic fan sizing
What Is a Whole House Fan? (Not the Same as an Attic Fan)
A whole house fan is not an attic fan. Green Building Advisor explains that a whole house fan is designed to cool a house, while a powered attic ventilator is designed to lower the temperature of an attic. The Building America Solution Center describes a whole house fan as a fan, usually installed in the ceiling, that helps cool the house by drawing air in through open windows at times when the outside air is cooler than the inside air.
The Building America Solution Center says 12 to 23 air changes per hour can be effective, so the fan replaces the air in the house every few minutes. That is not the same as cooling the house in a few minutes. QuietCool advertises savings of up to 50 to 90% on A/C usage, but that is the maker’s claim for times when the fan runs instead of the air conditioner, not a measured result for every home.
A whole house fan sits in the ceiling between the living space and the attic, or in the attic with a duct to a ceiling grille. The attic needs enough vent area to let that air out: at least 1 square foot of net free vent area per 750 CFM of airflow, according to the Building America Solution Center.
There are three types of whole house fans:
- Standard (ceiling-mounted): the traditional design sits in the ceiling and pulls air straight up from the living space into the attic. When the fan is off, the opening can leak heat, so it needs to be covered and sealed in cold weather.
- Ducted (inline): the fan hangs in the attic and connects to a ceiling grille through a short, curved acoustic duct. The Building America Solution Center says this design greatly reduces the noise that reaches the living area.
- Covered or insulated: some whole house fans have an automatic drop-down cover that seals the ceiling opening when the fan is not in use.
Safety: open windows before switching on a whole house fan. The Building America Solution Center warns that the fan can quickly depressurize the house if there are not enough windows open. It also says fireplace doors and dampers should be closed first, and that combustion appliances that draw room air or have a standing pilot light are not recommended in homes where a whole house fan will run.
What Is a Gable-Mounted Attic Fan?
A gable-mounted attic fan is mounted in a gable wall with a gable vent.
The gable wall is the triangular wall that’s created when the pitched roof of a house meets the side of the house. A gable vent is a ventilation system that you install in a gable wall.
If there is not already a gable vent, you’ll need to build one.
What Is a Roof-Mounted Attic Fan?
Roof-mounted attic fans require you to make a hole in your roof, install the fan, and then seal the openings.
Installation is more involved than for a gable fan, because it means cutting through the roof deck and flashing the opening so it does not leak. This is a job for a roofer unless the homeowner is experienced and equipped to work safely on a roof.
For it to work correctly, you’ll need to cut a hole and mount the fan on a sheet metal or plastic base. This procedure can take quite a bit of time.
The fan sits under a weatherproof dome or hood that protects it from rain and snow.
What Is an Electric Attic Fan?
An electric attic fan is powered by electricity.
The fan is generally connected directly to an electric circuit (through wiring).
Many wired attic fans include a built-in adjustable thermostat that switches the fan on automatically when the attic reaches a set temperature. Some also have a humidistat.
Like any other fan, you should probably check on your attic fan routinely throughout the year.
Check older fans against recalls. In August 2025 the U.S. Consumer Product Safety Commission announced a recall of about 2.9 million electric motors used in gable and roof mounted attic fans distributed by Air Vent and sold from August 2003 through December 2013. The CPSC said the motor’s safety cutoff may pose a risk of short circuit and fire, and that there had been 159 reports of burning or fire. The model numbers and the refund process are on the CPSC recall page (recall number 25-451).
What Is a Plug-In Attic Fan?
Some attic fans come with a power cord and plug into an outlet. QuietCool’s smart gable attic fans, for example, include a 20 foot power cord. Many other models are wire-in only.
As you might guess, it’s a much simpler process.
Direct wiring connects the fan to household mains power and should be done by a licensed electrician. A plug-in model only helps if the attic already has a suitable outlet within reach of the cord. Adding an outlet is also electrician’s work.
What Is a Solar Attic Fan?
A solar attic fan is powered by the sun.
A solar attic fan runs from its own panel, so it adds nothing to the electric bill. The savings are modest, though. The Florida Solar Energy Center tested solar attic fans, measured about a 6% drop in air conditioner use, and estimated a payback of more than twenty years.
Solar attic fans come in roof-mounted and gable-mounted versions. QuietCool, for example, lists both solar gable and solar roof mount attic fans.
If you’re thinking about buying a solar attic fan, here are some factors to consider:
- Does it come with a thermostat?
- Does it come with a humidistat?
- Does it include hybrid electric capabilities?
- Does it work on your type of roof? (some only work on shingled roofs)
- Can it be remotely controlled?
- Does it come with a protective screen?
- How does it handle the rainfall and other weather conditions?
What Is a Garage Attic Fan?
A garage attic fan is an attic fan installed in the ceiling of your garage.
It pulls outside air in through the garage’s existing vents and pushes garage air up into the attic space above. QuietCool sells one as a garage whole house fan.
A garage ceiling often forms part of the fire separation between the garage and the rest of the house, so cutting a fan opening into it is not a casual job. QuietCool’s garage fan includes an integrated 2 hour UL fire damper. Check with the local building department before installing one.
What Is a Smart Attic Fan?
A smart attic fan is controlled by an app on a smartphone. QuietCool’s smart gable fans, for example, let the owner monitor attic temperature and humidity, run the fan manually and change settings from the app.
Before buying a smart attic fan, ask the maker how the fan behaves after a power outage or when the Wi-Fi is down.
What Is an Old Style Attic Fan?
An old style attic fan usually means a traditional whole house fan: a large fan in the ceiling that pulls air straight up into the attic.
Newer ducted designs use a short acoustic duct between the fan and the ceiling, which the Building America Solution Center says greatly reduces noise.
What Size Attic Fan Do You Need?
Attic fans are sized by airflow, measured in cubic feet per minute (CFM), not by the dimensions of the housing.
Attic fans come in many sizes to match the size of the attic.
The Home Ventilating Institute rule of thumb is to multiply the attic floor area in square feet by 0.7 to get the fan airflow needed in CFM. That works out to about 700 CFM for every 1,000 square feet of attic. For a particularly dark or steep roof, HVI recommends a rating about 15% higher. The fan also needs enough intake vent area: HVI calls for at least 1 square foot of inlet area for every 300 CFM of fan capacity.
For very large spaces, you may even need more than one attic fan.
What Does an Attic Fan Do?
An attic fan pulls the hot air out of your attic.
As the fan pushes hot air out, cooler outside air comes in through the attic’s soffit and gable vents to replace it.
This cools the attic, not the rooms below. Any effect on the living space is indirect. In the Florida Solar Energy Center test, solar attic fans lowered the daily peak attic air temperature by an average of 22°F, and air conditioner use fell by about 6%.
ENERGY STAR says natural air flow in a well-vented attic moves super-heated air out in summer, protecting roof shingles and removing moisture. Building Science Corporation notes that shingle color and roof orientation affect shingle durability more than venting does, so longer roof life is not a strong reason to buy a fan.
This video from the maker of QuietCool fans shows how an attic fan moves air. It is a maker’s video, so treat any savings claims as marketing:
Attic Fan Safety: What to Check First
- Air leaks: ENERGY STAR warns that if the attic has blocked soffit vents and is not well sealed from the rest of the house, an attic fan will suck cool conditioned air up out of the house and into the attic. Seal and insulate the attic floor and clear the soffit vents before adding a fan.
- Backdrafting and carbon monoxide: a fan that pulls air out of the house can also pull exhaust back down the flue of a gas water heater or furnace. Building scientist Allison Bailes of Energy Vanguard lists backdrafting a water heater and putting carbon monoxide in the house among the real problems caused by power attic ventilators. If the home has fuel-burning appliances, have a qualified contractor test for backdrafting with the fan running.
- Carbon monoxide alarms: the U.S. Consumer Product Safety Commission says to install CO alarms on every level of the home and outside sleeping areas.
- Recalls: check an existing fan against the August 2025 CPSC recall of about 2.9 million Air Vent attic fan motors (recall 25-451).
- Installation: mains wiring should be done by a licensed electrician. Roof-mounted fans mean working at height and cutting the roof, and attics get very hot in summer, so plan attic work for a cool part of the day or hire a professional.
What Does an Attic Fan Not Do?
An attic fan does not cool the living space. It only moves air through the attic.
It’s not a magic solution.
You should still use air conditioning or fans to cool the home when it gets hot. ENERGY STAR’s advice is to air seal and insulate the attic floor and keep the attic well ventilated with passive vents and natural air flow. A fan is a supplement to that, not a replacement.
Who Is an Attic Fan For?
An attic fan is worth considering for a vented attic that still gets very hot even though the attic floor is air sealed and insulated and the soffit vents are clear. Even then the payoff is limited: the Florida Solar Energy Center put the payback for the solar attic fans it tested at more than twenty years.
Attic ventilation matters in winter too. ENERGY STAR says a natural flow of outdoor air helps keep the attic cold, which reduces the potential for ice damming. That is a point about passive vents, not a reason to run a fan.
Fan size depends on the attic floor area, not the type of house. See the sizing rule above.
Who Is an Attic Fan Not For?
An attic fan is a poor fit for a home with no vented attic, for an attic with blocked soffit vents or an unsealed attic floor, and for a home with fuel-burning appliances that have not been checked for backdrafting.
If you don’t have an attic, then there’s no need to install one.
You would simply waste money.
Pros and Cons of an Attic Fan
Let’s quickly go over the major pros and cons of an attic fan.
Check out this table of advantages and disadvantages:
| Pros | Cons |
|---|---|
| Solar models use no grid power | Wired models use electricity (the Florida Solar Energy Center notes most draw 250 to 300 watts) |
| Lowers peak attic temperature | Long payback (more than twenty years in the FSEC solar fan test) |
| Can slightly reduce air conditioner use (about 6% in the FSEC test) | Does not cool the living space |
| Models with a humidistat can run on attic humidity | Can pull cooled air out of a leaky house (ENERGY STAR) |
| Thermostat control runs it automatically | Can backdraft fuel-burning appliances; some older motors were recalled for fire risk (CPSC 25-451) |
Example Attic Fans by Type
The best attic fan is one that fits in your budget, lasts many years, and does what it promises.
The table below lists example models by type, as described on the makers’ own pages. These are examples, not tested picks.
| Type | Example Model |
|---|---|
| Solar roof mount | QuietCool 40 Watt Solar Roof Mount Attic Fan |
| Solar | Solaro Aire series |
| Wired roof mount | Broan 358 (listed by Broan as discontinued; Broan names the 356BK as its replacement) |
| Smart gable mount | QuietCool Smart Gable Attic Fan (AFG SMT PRO-2.0) |
| Whole house fan (not an attic fan) | QuietCool QC ES-7000 (Energy Saver series) |
| Wall exhaust fan (not an attic fan) | Maxx Air IF24UPS, a 24-inch wall exhaust fan for garages, barns and warehouses |
| Wired gable mount | Maxx Air / Cool Attic CX1500, a 1,300 CFM gable mount power attic ventilator |
Final Thoughts: What Is An Attic Fan?
An attic fan can lower attic temperature, but it only works well and safely when the attic floor is sealed, the intake vents are clear and any fuel-burning appliances have been checked for backdrafting. For many homes, air sealing, insulation and passive vents come first.
You can purchase them from Amazon, manufacturer websites, and many home improvement stores (Lowe’s, Home Depot and others).
What to read next:
Sources
ENERGY STAR (about attic ventilation)
Florida Solar Energy Center (photovoltaic attic ventilator fans, 2000)
Building America Solution Center (whole-house fans)
Home Ventilating Institute (how much ventilation do I need?)
CPSC (recall 25-451, attic fan motors)
CPSC (carbon monoxide information center)
Energy Vanguard (power attic ventilators)
Green Building Advisor (fans in the attic)
Building Science Corporation (understanding attic ventilation)
QuietCool (attic fans)
Broan (model 358)
Maxx Air (CX1500 gable mount power attic ventilator)
Energy.gov (whole house fans)
Bob Vila
Reviewed October 2026. We corrected the main answer (an attic fan cools the attic, not the living space, and is not the same as a whole house fan), replaced unsupported savings and performance claims with measured figures, turned the product picks into examples with makers’ details, and added a safety section on air leaks, backdrafting and a 2025 motor recall, using ENERGY STAR, the Florida Solar Energy Center, the Building America Solution Center, the Home Ventilating Institute, the CPSC, Energy Vanguard, Building Science Corporation, QuietCool, Broan and Maxx Air.