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Should I vent my attic?
Ventilation to reduce summer heat build up in an attic has also been challenged recently by research done at th Florida Solar Research Center and the Building Research Council in Illinois. Much of the heat in an attic is from radiant heat transfer. The hot sheathing radiates heat to the ceiling or other objects in the attic. To cool an attic, outside air is vented through attic or insulation is added to the ceiling to prevent the attic heat from warming the living space. Research has shown that the ventilation rate would have to be quite large to make much difference in an attic temperature. In the summer, the best you could possibly achieve was outside temperature. With a very large fan, using lots of energy, you might get close to outside temperatures. In winter this would result in a colder attic as well.

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