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Department of Energy (DOE) determination is a statute mandated by the Energy Conservation and Production Act for the DOE to review the most recently published energy efficiency codes.

NMHC 2009 to 2012 Cost Study Cost Study ChartsĪ U.S.

NMHC Multifamily Methodology and Cost Charts.

2012 IECC Cost and Energy Savings Analysis.

Energy Code Percent Savings Calculation Methodology (White Paper).

These cost studies quantify the economic impact of adopting specific energy codes and include the methodology used.

Michigan Log Home Legislation (Analysis).

Log Home Energy Performance White Paper.

These are code amendments that help fix problems created in the IECC that would otherwise significantly increase the construction cost of log homes. More stringent provisions in the 20 energy codes have made it increasingly difficult for log homes to meet requirements. NAHB has developed a series of adoption kits that include highlights of changes from the previous code, associated cost increases and a list of suggested amendments that offer more cost-effective and affordable energy conservation code provisions than available in the model codes. When a state or jurisdiction goes through the adoption process for an energy code, there are typically public hearings and an opportunity to amend the code prior to adoption. A positive determination by DOE triggers a series of requirements that are outlined in the DOE Determinations State Certifications Fact Sheet. The two most widely adopted energy codes are the International Energy Conservation Code (IECC) and ASHRAE’s Energy Standard for Buildings Except Low-Rise Residential Buildings (ASHRAE 90.1).Īfter an energy code is published (IECC for residential and ASHRAE 90.1 for commercial and multifamily above three stories in height), the Department of Energy compares the latest edition of the code to the previous edition to determine if the code has become more energy efficient. National model energy codes are developed and published on a three-year cycle.