Cost Effectiveness of 2015 IECC Compliance Using the HERS Index

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Energy Efficiency; Buildings; EnergyGauge; Energy Codes


The EnergyGauge HERS software tool is used to examine the 2012 IECC Standard Reference Design (IECC SRD) configuration for three-bedroom, one-story 2000 ft2 and three-bedroom, two-story 2,400 ft2 single-family homes in sixteen representative U.S. cities. The energy use of the 2012 SRD homes is compared against the energy use of homes complying with the 2015 IECC using the ERI compliance method.HERS simulations for each home are conducted for both a best case home orientation and a worst case home orientation. Improvements to the 2012 IECC SRD homes are made such that the HERS Index for the homes are at or below the ERI compliance scores prescribed by the 2015 IECC. The incremental improvement costs are estimated as the difference in cost between the SRD measure costs and the measure costs for the 2015 ERI compliant homes. Economic cost effectiveness calculations are performed in accordance with Section 4.6, ANSI/RESNET 301-2014. The analysis shows that the 2015 IECC ERI scores are cost effective in all of the 16 cities for all of the homes under all of the conditions studied. On a national basis, the climate zone weighted average net present value (present value life-cycle savings minus present value life-cycle improvement costs) for the cohort of homes is $5,219. This is significant considering the fact that the weighted average first cost of making the energy efficiency improvements is $3,338.

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Buildings - Energy Codes; Buildings - Energy Efficiency; Buildings - EnergyGauge

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