The District of Columbia Sustainable Energy Utility (DCSEU) (see Single-Family Rooftop for more on this) offers technical assistance and rebates to multifamily housing developers and property managers who work with the DCSEU to incorporate energy efficiency measures, including solar thermal hot water heating systems for gas heated central hot water systems, in the new development, redevelopment, or substantial rehabilitation of multifamily housing in the District. As noted by DCSEU, the greatest opportunities for cost-effective energy savings present themselves at the time of new construction or major rehabilitation. Applicants must have substantial funding commitments in place and for income-qualified enhanced rebates at least 66 percent of the residential units per building must be designated for or inhabited by households with incomes at or below 60 percent AMI.
The National Housing Trust (NHT) provides an on-the-ground example for their multifamily affordable buildings in Washington, D.C. Referred to as the NHT/Enterprise venture, more than 20 buildings in D.C. will be equipped with solar thermal panels for hot water and photovoltaic systems for space heat and other electricity uses.