The Radcliffe Institute has long been a leader in thoughtful experimentation and progressive innovations. As an early adaptor in sustainability, Radcliffe had previously constructed two geothermal well systems within the Radcliffe Yard: a 2-well system serving the Gym and a larger 5-well system at Byerly Hall, located immediately adjacent to Fay House. The Byerly Hall system appeared underutilized. Could Fay House be incorporated into the 5-well system at Byerly Hall, creating a geothermal district with two buildings served by a single geothermal system? The opportunity was compelling, accomplishing both energy efficiency goals and historic preservation, while avoiding construction of new, costly systems. As it turns out, when it comes to geothermal, one plus one is sometimes, in fact, three