In October 2013 the International Code Council added an Energy Rating Index option to the 2015 version of the International Energy Conservation Code (IECC). The Energy Rating Index Option set the following scores as compliance to the 2015 IECC: Climate Zone 2015 IECC Energy Rating Index Score Zone 1 52 Zone 2 52 Zone 3 51 Zone 4 54 Zone 5 55 Zone 6 54 Zone 7 53 Zone 8 53 The 2015 IECC Energy Rating Index performance path also requires builders to achieve the mandatory code requirements of the IECC, follow hot water piping provisions and comply with the minimum insulation and window envelope performance requirements of the 2009 IECC. To educate code officials, home builders and consumers on the Energy Rating Index compliance option RESNET has produced a series of factsheets. The factsheets cover: Overview of the ERI Performance Path in the 2015 IECC – This factsheet explains the new Energy Rating Index performance option to the 2015 IECC. Energy Rating Index Performance Path Score Alternatives – This factsheet compares HERS Index Scores for the 2009 IECC, 2012 IECC, 2015 IECC and the proposed alternative scores advocated by the Natural Resources Defense Council, Leading Builders of America and the Institute for Market Transformation. The factsheets are designed to give certified RESNET Home Energy Raters, energy efficiency advocates and supporting industries tools to educate code jurisdictions on the benefits of the Energy Rating Index performance option to the IECC.