Energy Saved by Insulation of House

Attics

• Heat rises, so the majority of heat loss in a house is through the roof. Because of this, the attic is the most important part of a house to insulate. It is also one of the easiest places to add insulation. Insulation in attics is typically loose-fill or batt insulation. Loose-fill is usually less expensive, easier to install, and provides more insulation than batt insulation, so is the preferred option. Insulation does not stop airflow, so it is important to seal cracks before insulation to prevent air movement between the attic and living space.

Exterior Walls

• Well insulated exterior walls save energy and increase comfort in homes. It is easiest to install wall insulation as the walls are constructed, but adding insulation to existing walls is possible. Walls are typically insulated with batt or rigid insulation, but when adding to existing walls it is better to use loose-fill or sprayed insulation. Again, before insulating, make sure the walls are well sealed. The best insulated home is still energy inefficient if it is drafty.

Pipes and Air Ducts

• Air ducts that deliver hot air for space heating and hot water pipes often run through unheated spaces such as attics, basements, garages or crawlspaces. Heat is quickly lost through ductwork and water pipes if they are not insulated. Foam insulation, preformed to easily fit around water pipes, is available at any hardware or home supply store. Check ductwork for leaks and seal with tape before insulating. Typically, HVAC installers insulate with rigid fiber board insulation, but round ducts are easily insulated by wrapping with fiberglass batt insulation.

Windows and Doors

• Windows and glass doors are not insulated the same way walls and roofs are, but some provide more insulation value than others. In double-pane windows, the space between panes provides insulation. Air is a good insulator and costs nothing, but argon gas is a better insulator, so many energy efficient windows are filed with argon. Krypton gas is an even better insulator, but due to its high cost, argon filled windows are usually more cost effective.