In fact the home power article states that a typical 250 watt fan would use 180 kwh per month if run continuously.
Energyvanguard power attic.
Then they moved from passive to active and latched onto the powered attic ventilator.
This is most often done with spray polyurethane foam spf insulation either open cell or closed cell.
These are real problems from real houses that have really happened.
Power attic ventilators banned by new georgia energy code.
Energy vanguard this powered attic ventilator in a gable wall was one of eight in that attic.
A better way to reduce the attic temperature is to go after the source the radiation constantly blasting the attic from the bottom of the roof deck and rafters.
Sources such as the billings gazette energy vanguard and home power all have articles that essentially say the same thing.
There s a new boss in town.
And it s part of the reason that my state georgia has banned power attic ventilators unless they re solar powered which was a concession needed to get the grid powered fans banned.
But there s really a more fundamental reason that power attic ventilators won t help a lot and for some reason i didn t mention that in the original article.
An attic that s brought inside the building enclosure is a beautiful thing.
Another would be backdrafting a water heater and putting carbon monoxide in the house.
Powered attic ventilators are the worst way to try to keep your attic cool.
Attic power ventilators are simply not worth the cost and effort.
For decades concerned homeowners have looked for ways to keep their attics cool.
They ve been well discussed here and other places but briefly they re not cost effective don t deal with the problem where it starts are using convection to solve a radiant heat problem and can even be dangerous by backdrafting combustion appliances and putting carbon monoxide in the home.
The new energy code that went into effect in georgia this year dealt a body blow to the power attic ventilator industry.
Gable vents ridge vents turtlebacks and whirlybirds.
Move over powered attic ventilator.
These attic fans can move a lot of air through an attic but that doesn t have much effect on the radiant heat flow.
Only one type is allowed.
They re going after the air but the air is hot only because all the solid materials are hot.
Now we don t have to settle for a technology that pulls conditioned air up from the house.
Here in the southeastern us open cell is most often the spray foam of choice.
That s one reason power attic ventilators aren t a good solution.
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