Blown Insulation for Existing Vented Attic Description Guide describing how to insulate a vented attic in an existing home using blown insulation added to the attic floor.
Air Sealing, Insulating, and Venting Attics and Roofs to Reduce Heat Gain Description Information guide providing links to guides describing specific ways to air-seal, insulate, and ventilate attics and roofs to minimize heat gain in new and existing homes.
Sealed and Insulated Flex Ducts Description Guide describing how to air seal and insulate flex ducts.