For the Green Infrastructure and Buildings Credit on District Heating and Cooling, single-family residences may be excluded from the district system if the energy savings from including them are negligible or if it is impractical to connect them. The LEED system recognizes that it may not be efficient or cost-effective to include single-family homes in a district energy system, particularly if they are spread out over a large area. Therefore, excluding them does not negatively impact the credit achievement as long as the overall system design meets the efficiency and coverage requirements for other building types.

References:

LEED v4 Neighborhood Development Guide: Discusses the criteria for District Heating and Cooling credits, including allowances for excluding certain building types like single-family residences (USGBC, LEED v4 Neighborhood Development Current Version).

LEED Reference Guide for Neighborhood Development: Provides guidance on the conditions under which buildings can be excluded from a district energy system without affecting credit eligibility (USGBC, LEED Reference Guide for Neighborhood Development).