The Design Energy Code is an input in General Inputs section 1. For whole building projects with the value of the "Energy Model Status" input field of "Will NOT be Modeled" or "Will be Modeled", but the "Has the project established an EUI yet?" is not checked, the Design Energy Code selection determines the SAVINGS for the project. The SAVINGS percentage is a code equivalent % savings of the selected code to the code basis for the 2030 Challenge, which is CBECS 2003.
Step-by-step guide
The Design Energy Code Equivalent Percentage Savings values are based on a collaboration with New Buildings Institute, which utilizes the code determination analysis by Pacific Northwest National Laboratory (PNNL) for each new version of ASHRAE Standard 90.1 to establish zEPI scores that ultimately become the code equivalent savings (100 - zEPI).
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- If the % savings pEUI reduction for modeled projects is less than the design code % saving equivalent, consider adjusting your baseline so that you are meeting the design code equivalent % savings.
- If using code equivalent savings the selected design energy code will drive the % savings
- If a project has an energy model or will have an energy model, the % savings is derived from the pEUI and the baseline EUI.
- If a project has an energy model or will have an energy model, check to make sure the % savings is a reasonable number – comparing to the code equivalent % savings is a helpful benchmark.
- If the % savings value is unexpected, reevaluate and consider adjusting the baseline EUI.
Design Energy Code Equivalents | |
Design Energy Code | Approximate % Reduction from Average |
ASHRAE 90.1-1999 | 10% |
ASHRAE 90.1-2001 | 10% |
ASHRAE 90.1-2004 | 25% |
ASHRAE 90.1-2007 | 31% |
ASHRAE 90.1-2010 | 42% |
ASHRAE 90.1-2013 | 46% |
ASHRAE 90.1-2016 | 50% |
California Title 24 2005 for high rise residential | 35% |
California Title 24 2005 for single family residential | 30% |
California Title 24 2008 | 40% |
California Title 24 2010 | 40% |
California Title 24 2013 | 48% |
California Title 24 2016 | 53% |
California Title 24 Non Residential 2008 | 40% |
California Title 24 Residential 2005 | 35% |
California Title 24 Residential 2008 | 40% |
IECC 2003 | 10% |
IECC 2006 | 20% |
IECC 2009 | 31% |
IECC 2012 | 42% |
IECC 2015 | 46% |
*NECB 2011 | 45% |
Older than 1999 | 0% |
Massachusetts Stretch Code | 52% |
Oregon Energy Code | 25% |
Oregon Energy Code 2010 | 34% |
Oregon Energy Code 2014 | 40% |
Oregon Energy Efficiency Specialy Code 2010 | 25% |
Oregon Energy Efficiency Specialy Code 2014 | 40% |
Washington Energy Code | 25% |
Washington Energy Code 2012 | 25% |
Washington Energy Code 2015 | 48% |
Note: These are estimates of code comparison based on analyses by Pacific Northwest National Laboratory, New Buildings Institute, and Architecture 2030. These percentages are provided to enable the inclusion of non-modeled projects in analysis for the AIA 2030 Commitment. *Source for this code is from the National Research Council Canada and New Buildings Institute. | |
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