The U.S. Department of Energy (DOE) encourages greater energy efficiency in commercial buildings through the development and implementation of model energy codes and standards. In support of this goal, DOE assesses the savings associated with updated editions of ANSI/ASHRAE/IES Standard 90.1: Energy Standard for Buildings Except Low-Rise Residential buildings. DOE relies on an established methodology , and conducts both national and custom state-level analyses. In addition, a State Savings Calculator allows for further customization based on various economic perspectives and other state-level assumptions.
Pacific Northwest National Laboratory (PNNL) assesses recent editions of ASHRAE Standard 90.1 to quantify the associated energy & cost savings. This analysis confirms the cost-effectiveness of updated editions of the model codes in prominent building types across U.S. climate zones, and is of interest to policymakers, as well as adopting states & localities. The following national analyses are currently available:
- Cost Effectiveness of Standard 90.1-2013 
- Energy and Energy Cost Savings Analysis of the 2015 IECC for Commercial Buildings 
PNNL also conducts analysis to assess savings and cost effectiveness within individual states. These analyses are customized based on current state energy codes, and take into account varying state-level conditions, such as incremental costs, utility rates and construction trends. The table below contains reports covering the various state scenarios based on ASHRAE Standard 90.1-2013.
State Savings Calculator
The State Savings Calculator provides a means of further tailoring state-level cost-effectiveness analysis. This interactive tool mimics the overall DOE methodology, but allows for customized economic assumptions and other parameters that may vary on a state-by-state basis. These include parameters such as local cost adjustments, energy prices and escalation rates, inflation and taxes, loan terms, and the overall study period used for the analysis. A report can also be generated that summarizes results in a format similar to the official PNNL state analysis reports.
Download the commercial state savings calculator: Commercial_State_Savings_Calculator_V1.0Rev1.zip 
Note: The calculator is based in Microsoft Excel. Macros must be enabled for proper functioning. It is recommended to open the calculator in a separate instance of Excel.
|Alabama ||Alaska ||Arizona ||Arkansas |
|California*||Colorado ||Connecticut ||Delaware |
|District of Columbia ||Florida ||Georgia ||Hawaii |
|Idaho ||Illinois ||Indiana ||Iowa |
|Kansas ||Kentucky ||Louisiana ||Maine |
|Maryland ||Massachusetts ||Michigan ||Minnesota |
|Mississippi ||Missouri ||Montana ||Nebraska |
|Nevada ||New Hampshire ||New Jersey ||New Mexico |
|New York ||North Carolina ||North Dakota ||Ohio |
|Oklahoma ||Oregon*||Pennsylvania ||Rhode Island |
|South Carolina ||South Dakota ||Tennessee ||Texas |
|Utah ||Vermont ||Virginia ||Washington*|
|West Virginia ||Wisconsin*||Wyoming |
|*The structure of this state's code differs substantially from that of ASHRAE 90.1 or the IECC equivalent.|
Energy & cost savings analyses for previous editions of ASHRAE Standard 90.1 are also archived .