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A new kind of roof-and-attic system field-tested at the
Department of Energy's Oak Ridge National Laboratory keeps homes cool in summer
and prevents heat loss in winter, a multi-seasonal efficiency uncommon in roof
and attic design.
The system improves efficiency using controls for radiation,
convection and insulation, including a passive ventilation system that pulls
air from the underbelly of the attic into an inclined air space above the roof.