Energy Saving Devices

Although you can achieve considerable savings in space conditioning costs by insulating the foundation, the installation costs can become relatively high, especially for retrofit projects. The type of materials used, the application method, and the extent of work all affect the overall cost. Simple payback is typically in the range of 6 months for a simple do-it-yourself installation to 20 years for professionally installed and more involved work. Adding foundation insulation during new construction is usually less expensive.

Field studies have found that foundation insulation for new houses (in the United States) has good economic outlooks, except for the warmest climates.

Source: U.S. Department of Energy