855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 306
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Calculate the sum of the peak heating load and peak cooling load per unit of treated floor area using either the WUFI Passive Design Tool or the Passive House Planning Package.
Additional considerations Under this option, projects designed to achieve Passive House compliance (using either PHIUS or PHI) will likely achieve three points.
PATH 2. ASHRAE 90.1 TRADE-OFF METHODS
For projects documenting EAp2: Minimum Energy Efficiency using the prescriptive method or Energy Cost Budget Method, Path 2 provides the most streamlined method for showing compliance. However, due to the limitations of the referenced ASHRAE 90.1 Trade-off Methods, it may not be possible to show loads reductions for some buildings using this path. For example, projects with minimal envelope contribution to peak thermal loads cannot achieve the required envelope loads thresholds. Similarly, the Total System Performance Ratio (TSPR) calculations referenced for the Ventilation Loads requirements are only available for a subset of building types.
Envelope loads Use the ASHRAE Standard 90.1, Section 5.6, Building Envelope Trade-off Compliance Path analysis to show credit compliance. (Refer to EAp2: Minimum Energy Efficiency guidance on this topic). Amend the proposed inputs to reference measured air leakage. If this is not possible in the software interface, perform the air leakage testing as required, but use the ASHRAE 90.1 prescriptively required air leakage as a conservative savings estimate.
Extract the system peak heating loads and the system peak cooling loads from the modeled outputs for the proposed envelope factor and the base envelope factor.
Show the project achieves the required percentage improvement in the sum of system peak heating loads and system peak heating loads comparing the results for the two models. The peak load metric used here is distinct from the metric of annual energy cost used to assess compliance with ASHRAE 90.1 .
Ventilation loads This case rewards projects for a 10% improvement in the sum of building peak coincident heating loads and building peak coincident cooling loads achieved through HVAC control strategies addressing ventilation loads, such as demand control ventilation or energy recovery ventilation.
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 296