Thermal Performance of Unvented Attics in Hot-Dry Climates

Research output: NRELTechnical Report


As unvented attics become a more common design feature implemented by Building America partners in hot-dry climates of the United States, more attention has been focused on how this approach affects heating and cooling energy consumption. The National Renewable Energy Laboratory (NREL) has conducted field testing and hourly building simulations for several Building America projects to evaluateenergy use in vented and unvented attics in hot-dry climates. In summer, testing of the Las Vegas protoype house demonstrated that the thermal performance of an unvented attic is highly dependent on duct leakage.
Original languageAmerican English
Number of pages58
StatePublished - 2002

NREL Publication Number

  • NREL/TP-550-30839


  • conditioned attic
  • duct leakage
  • duct losses
  • EE
  • energy efficiency
  • sealed attic
  • unvented attics
  • vented attic


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