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11 the ceiling is well insulated (with 4-6 inches of insulation) the heat flow is small and any further reduction by attic ventilation would be meaningless. But if your ceiling is not well insulated and cannot be improved because of inaccessibility, fan ventilation can be an effective and economically justified way of reducing downward heat flow,” Smith said.
The fan, which needs to move air at a rate of only about one cubic foot per minute per square foot of ceiling area, should be mounted so as to exhaust air from high in the attic where temperatures are the hottest. It can be governed by a thermostat located where it will turn the fan on when the air temperature near the fan reaches 110 degrees or so.
‘‘In some cases, it is possible to reduce the
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