These thermostatically controlled fans are supposed to push out the upper attic hot air and draw in cooler outside air usually through the soffit vents.
Best way to vent your attic.
Powered attic ventilators are the worst way to try to keep your attic cool.
The best form of attic ventilation for your home is a balanced system where the intake vents are separate from the exhaust vents.
Hot air exhaust vents located at the peak of the roof allow hot air to escape.
This will then make the attic hot.
Soffit vents are intake vents located under the outside eaves of your home.
If two different types of exhaust vents are combined for example a ridge vent and a gable louver the primary path of air becomes the distance between the two types of exhaust vents.
As the sun shines on the top of your house the heat is absorbed by your roof.
For the best results place roof ventilation near the roof s peak and soffit vents in the eaves.
Air flows in through the soffit vents and out through the roof vents.
If you see dampness or frost you need better roof ventilation and some attic vents.
But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates.
Adding reflective roofing is another option you might consider when it comes to the best way to cool your attic.
The soffit vents allow convective air movement from the soffits of the residence to the ridge vent.
Reflective materials keep things cooler.
In other words the entire vent opening doesn t count as vented space.
Start with the attic floor.
That said air resistance and interference such as vent grates reduces the area of true ventilation.
Stop using your attic for storage.
Vents come in various styles.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
For this kind of system you need soffit vents and ridge vents.
Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic.
In addition insulation baffles must be installed at the point where the attic floor meets the roofline to prevent the attic insulation from migrating into the cavities and restricting the airflow from the soffit vents.