Federal Energy Management Program's New Technology Demonstration Program recently released a Federal Technology Alert on ground-source heat pump technology. Developed by the Pacific Northwest National Laboratory, this Federal Technology Alert, "Ground Source Heat Pumps Applied to Federal Facilities-Second Edition," describes how ground source heat pump technology can be an energy-efficient and cost-effective way to heat and cool federal facilities. It identifies several different types of ground-source heat pump systems, each with unique advantages and limitations. The document, an update of an FTA originally published in 1995, also outlines how to estimate potential costs and savings associated with ground-source heat pump systems applied to federal facilities.