The foam-filled frame acts as an additional insulator around seams and helps reduce noise. Doors, like windows, should have tight seals. Homeowners can use caulking around windows and doorframes to insure strong seams. Insulate existing walls with insulating foam. Foam is blown into walls throughout the home and takes up space within the walls.
Homeowners can also roll fiberglass insulation onto attic floors.
For the exterior, insulate with solid-core siding. While foam and fiberglass insulate only the wall cavity, solid core siding insulates the entire wall, including studs and joists. Solid-core siding features an insulated core inside the siding for increased thermal resistance. The U.S. Department of Energy and the Environmental Protection Agency developed the Energy Star logo to identify products which meet the energy-efficiency guidelines set by these two government agencies. When installed as suggested in the Energy Star Insulation Guide, products with this logo can save energy.