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A properly insulated basement can help reduce your energy costs. However, basement walls are one of the most controversial areas of a house to insulate and seal. You need to carefully consider the advantages and disadvantages, not to mention moisture control.

A properly insulated foundation can result in lower heating costs and more comfortable below-grade rooms, if you have any. It can also help prevent moisture problems, insect infestation, and radon infiltration in your home.

Insulating any floors above your unheated garage will help reduce the energy costs for the above conditioned space.

Properly insulated exterior walls in your house will not only increase comfort but also help you save on heating and cooling costs. For energy savings, you can add insulation to your walls in an existing house. If you're building a new house, you have many energy-efficient wall insulation options to consider.

Properly insulating your cathedral ceilings will help reduce heat loss in the winter and heat gain in the summer. Insulated ceilings allow ceiling temperatures to remain closer to room temperatures, providing an even temperature distribution throughout the house.

Properly insulating air ducts located in unconditioned spaces such as attics, crawl spaces, garages, or unfinished basements can help improve your home's energy efficiency.

Knee walls — often found in houses with finished attics — are vertical walls with attic space directly behind them. These walls are notoriously leaky and often uninsulated. For energy efficiency, a knee wall and the attic floor in the attic space behind it should be properly insulated and air sealed.

To insulate your attic stairs access, you can construct a lightweight, moveable box that will rest on the stair frame from the attic side.