This report highlights best practices to make steam heating systems in NYC’s multifamily stock significantly more energy efficient, thus reducing this important building sector’s oil and gas usage. The bottom line is that no single measure can maximize a steam system’s efficiency – a comprehensive approach must be taken. And the gains are significant. If we appropriately repair and upgrade steam heating systems in larger multifamily buildings, owners could save $146 million annually in heating and maintenance bills. In addition, 312,000 tons of carbon emissions could be avoided.