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For these project types, designers must select from a list of additional efficiency measures in Section 11 to earn the minimum number of “Energy Credits” required for the project’s building type and climate zone per Table 11.5.1-1. This affords a greater degree of flexibility for the project team to select the additional measures most feasible and appropriate for their project application.

Each of the efficiency measures referenced in Section 11 are awarded a specific number of base “Energy Credits” per building type and climate, equating to approximately 0.1% savings per credit (see ASHRAE 90.1-22, Tables 11.5.3-1–11.5.3-9). Section 11.5.2 outlines opportunities for further adjustments to augment these base credits for certain efficiency measures.

For example, an office project in climate zone 4A earns 8 base credits for achieving a 5% reduction in lighting power (L06), but this increases to 16 credits for a 10% reduction per the adjustment described in the detailed summary of this measure.

Combined credits for renewable and load management measures are limited to 60% of the total required energy credits per ASHRAE 90.1-2022, Section 11.5.2.

ASHRAE 90.1-2022, Addendum J provides an option for projects to use the Total System Performance Ratio (TSPR) to demonstrate overall improvement in HVAC performance rather than applying individual system efficiency measures.

ENERGY CREDIT ADJUSTMENTS (ASHRAE 90.1-2022 11.5.1)

o Mixed use projects . For projects with multiple building types, minimum required

credits and credits achieved are weighted by the gross floor area of each building type.

o Minimum required “Energy Credits” are adjusted lower than the default thresholds in

Table 11.5.1.1-1 for initial build-out construction and substantial alterations.

• Initial buildout projects must achieve between 25% and 50% of the referenced thresholds dependent on the project scope.

• Substantial alterations must achieve 50% of the referenced thresholds.

o Projects without roof availability for photovoltaic (PV) or meeting Section 10.5.1

exceptions may use the referenced equation to adjust required credits below the default threshold per Section 11.5.1(e).

   - Unconditioned spaces, semi-heated spaces, and parking garages must

achieve 50% of the credits referenced for “Other” building types in Table 11.5.1.1-1.

ASHRAE 90.1 4.2.1 compliance path: ECB method This approach compares the annual energy cost of the proposed design to that of a budget building. The budget building is essentially a clone of the proposed design but adjusted to just

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 108