With an attic fan you can cool the attic to the same temperature as it is outside greatly reducing the house from heating as quickly.
Exhaust fan no attic.
These fans exhaust into the attic space which is okay because they re moving fresh not hot air.
However the utility of attic ventilation fans is actually quite a controversial topic.
In moderate climates these are frequently used instead of air conditioning particularly in conjunction with a ceiling fan.
You usually run a whole house fan at night.
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The downside of attic ventilation fans.
During the day any cooler air brought in by the fan will be heated up immediately by the surrounding structure.
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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.
Use a short piece of 3 pipe to get away from the exhaust fan and an elbow.
During the summer an attic can be 40 to 50 hotter than the outside temperature which in turn heats up the house very quickly.
Attic fans perform this ventilation by pushing hot air out into the environment while also pulling fresh cool air into the attic.
I have pretty good soffit venting and turtles on the roof but the attic heats up a great deal.
Quietcool attic fans work almost everywhere almost anytime.
Even if the heating is radiant and conductive better airflow will still cool the surfaces somewhat and i have no moisture problem or ac efficiency problem to worry about.
Most fans cannot keep up.
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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.
An attic ventilation fan seems quite reasonable.
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The hard part is no hardware or home improvement store carries an offset 4 to 3 reducer and there is usually no clearance between the exhaust vent exit and the ceiling sheet rock.
These fans lower the temperature in the attic as well.
The result is a cooler attic space with plenty of air exchange.