The Commissioning, Preventive Maintenance, and Troubleshooting Guide for Commercial Ground-Source Heat Pumps, published by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), provides guidance to ensure proper operation of these systems. The guide includes commissioning requirements for GSHP systems in the design and program, construction and acceptance phases of a commercial project. In the area of preventive maintenance, the guide presents maintenance program actions and frequency for the major GSHP components. It also includes troubleshooting procedures for the four major subsystems making up GSHP systems. The cost of Commissioning, Preventive Maintenance, and Troubleshooting Guide for Commercial Ground-Source Heat Pumps is $69 ($55, ASHRAE members). To order, contact ASHRAE Customer Service at 800-527-4723 or visit www.ashrae.org.