Oak Ridge National Laboratory released findings from field tests of a roof and attic system that aims to improve the energy efficiency of residential buildings. The system uses a passive ventilation strategy that releases heat from the house and reduces its thermal load. A $2,000 retrofit with the system could save about $100 annually.
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Links:
[1] http://www.jetsongreen.com/2012/09/ornl-roof-attic-passive-ventilation-system.html