855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 158

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Option 3 solely addresses equipment installed or replaced in the project scope of work and therefore is appropriate for projects where base building systems serving the project are not electrified.

Option 1. No On-site Combustion — Base Building and Tenant Systems

Electrification Projects designed to operate entirely without on-site combustion for all building systems serving the project offer the greatest emission reduction through electrification. Projects pursuing this option must eliminate on-site combustion from the project system design and operations. If a tenant space is designed without on-site combustion, but fossil fuels are used for any base building system serving the project (such as a central hot water boiler, water heater, or shared air handling unit with fossil fuel furnace), the LEED ID+C: Commercial Interiors project cannot pursue this option. Refer to the Exemptions section for limited exceptions.

Efficiency Combined weighted average equipment efficiency for applicable space heating and SWH equipment serving the project must be at least 1.8 COP for initial buildout or at least 1.2 COP for projects in existing buildings. Refer to the guidance in the Weighted Average COP section.

Option 2. No On-site Combustion Except at Low Temperatures — Base Building and Tenant Systems

For Option 2, teams may apply any combination of Path 1, Path 2, and Path 3, which separately address electrification of space heating, service hot water heating, and cooking and other process systems serving the project, respectively.

PATH 1. SPACE HEATING

Electrification All space heating systems serving the project must be capable of operating without on-site combustion, except in low-temperature operating mode at or below 20°F (-6.5 °C). Electrified space heating equipment serving the project must be designed with sufficient capacity to meet the entire project space heating load at the system, zone and space levels for outdoor temperatures above 20°F (-6.5 °C) or the project’s design heating temperature. Hybrid designs with fuel/electric equipment must have a sequence of operations with at least one allelectric operating mode available above 20°F (-6.5 °C).

Efficiency Space heating equipment serving the project in climate zones 3 and above must have a weighted average equipment efficiency of at least 1.8 COP for initial buildout, or at least 1.2

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 147