Today’s evolving market for GeoExchange systems continues to develop solutions that are compatible with large buildings in urbanized areas where site areas for a traditional ground heat exchanger are extremely limited. For both new construction and retrofit situations, alternatives to a ground loop may exist such as waste water systems that recycle non-potable water. In fact, there are over 3500 municipalities with some level of recycled water distribution networks. These untapped resources offer both viable performance solutions and higher potential installation and operation cost savings. This presentation covers such a system at the Denver Museum of Nature & Science.