The ARIES Collaborative, a Department of Energy Building America research team, partnered with NeighborWorks America affiliate Homeowners' Rehab Inc. (HRI) of Cambridge, MA to implement and study improvements to the heating system in one of the non-profit's housing developments. The heating control systems in the 42-unit Columbia CAST housing development were upgraded in an effort projected to reduce heating costs by 15 to 25 percent. | Hydronic Heating Retrofits For Low-rise Multifamily Buildings - Phase 1 by National Renewable Energy Laboratory (nr, Paperback | Indigo Chapters