All three push hot air out of the attic. They differ in where they mount, how they get power and how much work it takes to put one in.
A gable attic fan mounts behind an existing vent in the gable wall, so nothing is cut through the roof. A roof mounted fan needs a new opening in the roof and fits homes without gable walls. A solar fan can mount either way and runs only when the sun is out, usually at lower airflow. The Department of Energy’s Building America program notes that solar units create less negative pressure. Any of the three can vent attic heat in any climate.
Search for an attic fan and you will see three kinds side by side. The choice is less about which one is best in general and more about what your roof looks like, where your power is and how much you want to spend on installation.
What is the difference between gable, roof and solar attic fans?
Gable and roof describe where the fan mounts. Solar describes how it gets power.
| Gable mount | Roof mount | Solar | |
|---|---|---|---|
| Where it goes | Inside the attic, behind a gable vent | On the roof deck, near the ridge | Roof or gable, with a solar panel |
| Roof penetration | None | New opening, flashed and sealed | Depends on the mount |
| Power | 120 volt outlet or hardwired | Often hardwired | Solar panel only |
| When it runs | Thermostat, timer or switch | Thermostat, timer or switch | When the sun is out |
| Airflow | Varies by model (CentricAir: 1,580 CFM) | Varies by model | Usually lower, per Building America |
| Best for | Homes with gable vents | Hip roofs and no gable walls | No attic outlet nearby |
CentricAir figure from the CentricAir Gable Mounted Attic Fan page, September 2026. Solar airflow note from Building America’s attic ventilation fan guide.
Why choose a gable attic fan?
It is usually the least invasive install, because it uses an opening your house already has.
A gable fan sits inside the attic against the back of an existing gable vent. There is no roof to cut and nothing new to flash, which keeps the weather tight roof you already have. The CentricAir gable fan fits standard vents framed 16 inches on center, plugs into a standard 120 volt outlet and draws 180 watts.
When does a roof mounted attic fan make sense?
When there is no gable wall to use.
Hip roofs slope down on all four sides, so there is often no gable vent at all. A roof fan solves that by mounting near the ridge, where the hottest air collects. The tradeoff is a new hole in the roof that has to be flashed and sealed like any other roof penetration, and roofing work adds cost and risk of leaks if it is done poorly.
Are solar attic fans worth it?
They cost nothing to run, but the research on savings is mixed.
Building America lists two benefits of solar units. They have no electricity cost, and they only run while the sun is shining, which keeps them from pulling humid night air into the attic. They also tend to have lower airflow, which creates less negative pressure.
A Florida Solar Energy Center study of photovoltaic attic fans found attic temperatures dropped more than 20°F. As summarized by Green Building Advisor, the cooling energy savings were about 6 percent and the payback on the installed cost ran more than twenty years.
What should you know before buying any attic fan?
Seal the ceiling first, and make sure the attic has enough intake vents.
- Negative pressure. Building America warns that attic fans can pull conditioned air from your rooms up through ceiling gaps.
- Combustion appliances. It also warns that a fan can backdraft fuel burning equipment in the attic.
- Intake vents. Every attic fan needs enough soffit or gable vents to pull replacement air in from outside.
- Cooling your rooms is a different job. None of these fans cools your living space. A whole house fan does.
The CentricAir gable attic fan: 1,580 CFM, 180 watts, and an adjustable thermostat included.
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Frequently asked questions
Is a gable fan or a roof fan better?
Neither moves air better by default. A gable fan is easier to install because it uses an existing vent. A roof fan is the option for homes without gable walls, such as hip roofs, but it needs a new hole in the roof.
Do solar attic fans work?
They move air when the sun is out. A Florida Solar Energy Center study found attic temperatures dropped more than 20°F, but cooling savings were modest and the payback ran longer than twenty years.
Can an attic fan pull cool air out of my house?
Yes. Building America warns that an attic fan lowers attic pressure and can draw conditioned air up through gaps in the ceiling. Sealing the ceiling and providing enough intake vents reduces this.
Do attic fans need intake vents?
Yes. Building America says to ensure ample intake vent area, such as soffit or eave vents, so the fan pulls outdoor air instead of air from the living space.
Keep reading
Sources
- U.S. Department of Energy, Building America Solution Center (PNNL), Attic Ventilation Fans, updated Sept. 21, 2022.
- Danny Parker and John Sherwin, Florida Solar Energy Center, Performance Assessment of Photovoltaic Attic Ventilator Fans, May 2000.
- Peter Yost, Green Building Advisor, Are Solar Powered Attic Ventilators Green?, published Feb. 26, 2009, updated Aug. 8, 2018 (summarizing Florida Solar Energy Center research).
- CentricAir Gable Mounted Attic Fan product page, centricair.com, accessed Sept. 2026.