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855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 163

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Weighted Average COP

Minimum weighted average COP criteria is predicated on a design that uses heat pump technology instead of inefficient electric resistance heating to meet most of the project’s space heating and SWH loads for new systems; or approximately 20% of the project’s space heating and SWH loads for existing buildings. This limit increased grid peak demand associated with electrification.

Exclusions from weighted average COP determination The following equipment may optionally be excluded from the weighted average COP determination:

  • Space heating equipment in climate zones 0–2 . This equipment is not required to be included because electric resistance heating contributes much less to peak grid load in hot climates than in cooler climates. To determine the project’s climate zone, refer to ASHRAE Standard 169, Climatic Data for Building Design Standards [42] .

  • Supplemental heating equipment designed only for operation at or below 20°F (- 6.5 °C) . This equipment is not required to be included because it can skew the average efficiencies calculated using capacity weightings of rated efficiencies. This exclusion applies to supplemental or auxiliary electric heating used for space heating or SWH, as well as fuel used for low temperature operation for space heating or SWH in Option 2.

  • Point of use SWH equipment in nonresidential spaces meeting ASHRAE 90.1-2022, Section 11.5.2.3.3, W05, without exceptions . For nonresidential projects with low SWH demand distributed throughout the building, electric point-of-use water heaters are often more appropriate than centralized heat pump equipment and negligibly increase peak electric demand. Therefore, teams may exclude point-of-use water heaters in nonresidential spaces from the COP determination if they comply with ASHRAE 90.1-2022 11.5.2.3.3, W05 without exception.

Nonresidential SWH equipment that does not comply with the ASHRAE 90.1-2022 11.5.2.3.3 criteria must be included in the determination of weighted average COP. For example, storage water heaters supplying showers or commercial kitchen operations must be included in the determination of weighted average COP.

This exception does not apply to equipment in residential spaces, due to higher SWH demand for these space types.

42 “ASHRAE Standard 169 Climatic Data for Building Design Standards”, ASHRAE, accessed March 31, 2025, https://www.ashrae.org/file%20library/technical%20resources/standards%20and%20guidelines/standards%20addenda/169_2020_a _20211029.pdf.

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 152

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