The downside of attic ventilation fans.
Attic eave fan.
The attic fan kept my house cooler by 8f compared to pre fan installation days.
Most fans cannot keep up.
Even though an attic exhaust fan can incrementally lower the temperature of a very hot attic using a fan does not stop the source radiant heat.
However the utility of attic ventilation fans is actually quite a controversial topic.
It can quickly remove a larger volume of hot and or humid air from your attic when compared to static ventilation.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
After attic fan installation ac still off during day.
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Intake vents located at the lowest part of the roof under the eaves allow cool.
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Attic ventilation fans whether hard wired or powered by their own solar panels seem like a low cost and effective way to help keep your house cool.
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Thick ridges of ice on your eaves in winter are a sign of poor attic ventilation.
This was observed on numerous days following the installation.
Warm air that escapes rooms below gets trapped in the attic.
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Temp 92 f at 5pm.
Snow melts and the water refreezes on the cold eaves creating ice dams.
Attic fan ventilation attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents soffit and gable and pushing hot air to the outside.
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Temp 84f at 5pm.
During the day any cooler air brought in by the fan will be heated up immediately by the surrounding structure.
During workdays would leave air conditioner off when leaving in the morning.
However if your attic has blocked soffit vents and is not well sealed from the rest of the house attic fans will suck cool conditioned air up out of the house and into the attic.