All ductwork in the home is completely sealed, ensuring that conditioned air is delivered directly to intended locations. This saves energy and provides a more consistent indoor temperature. Ductwork located in the attic above the second floor is insulated to prevent unwanted heat loss or heat gain. Penetrations into the attic for ductwork are completely sealed at the perimeter. An independent testing agency measured duct leakage by sealing off all grills and registers and testing air leakage, verifying that leakage amounts were below the maximum allowed for Energy Star Homes.