Guidance contained in the Commissioning, Preventive Maintenance, and Troubleshooting Guide for Commercial Ground-Source Heat Pumps, published byASHRAE(Atlanta), ensures 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. To order, contact ASHRAE Customer Service at 800-527-4723 or visit the ASHRAE Online Bookstore at www.ashrae.org.