is to establish the minimum level of energy
efficiency for the proposed building and systems.
Design the building project to comply with both of the
The mandatory provisions (Sections 5.4, 6.4, 7.4, 8.4, 9.4 and
10.4) of ASHRAE/IESNA Standard 90.1-2004 (without amendments);
The prescriptive requirements (Sections 5.5, 6.5, 7.5 and 9.5) or
performance requirements (Section 11) of ASHRAE/IESNA Standard
90.1-2004 (without amendments).
Note that the USGBC deems Title 24-2005 to be directly equivalent
to ASHRAE 90.1-2004 for purposes of certification. California
LEED-NC v2.2 projects do not need to provide justification or
support of Title-24 2005 equivalence when applying for LEED-NC v2.2
certification, but doing so can satisfy the requirements as defined
in the linked
USGBC pdf document .
- Ensure this prerequisite early: Confirm with the Mechanical
Engineer that the design will meet all ASHRAE/Title24 minimum and
mandatory compliances for this credit.
- The documentation for the Minimum Energy Performance
Prerequisite can either be produced by the Mechanical Engineer
(typically using prescriptive methods) or by the Energy Modeler who
produces the documentation for EAc1 (based on performance
- If the Mechanical Engineer's standard practice does not meet or
exceed this prerequisite, he or she may not be the right engineer
for a LEED job.
- The 2005 Federal Energy Bill contains revisions to energy codes
and incentives to exceeding energy codes. Refer to the energy bill
and resulting policies that may impact your building.
- This credit has synergy and cost savings with measurement and
verification activities in credit EAc5, so be aware of both credits
when scoping and bidding this work.
- Minimum Energy Performance is a prerequisite for LEED
Certification and must be met.
Additional EDR Resources
Title 24 and Savings By Design
Design Briefs: Building
Integrated Building Design
Options & Opportunities
Design Briefs: Improving Mechanical System Energy
Chiller Plant Efficiency
Energy Management Systems
Efficient Lighting Systems
Guidelines: HVAC Simulation Guidelines