Effectiveness of Florida's Residential Energy Code 1979 - 2009

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Effectiveness of Florida’s Residential Energy Code: 1979 - 2009 (Revision of 1979 - 2007 Report) FSEC-CR-1806-09 Final Report June 15, 2009 Submitted to: Codes & Standards Office Florida Department of Community Affairs 2555 Shumard Oak Blvd Tallahassee, FL 32399-2100 DCA Contract #08-BC-28-12-00-22-002 (Mod 6) Submitted by: Mo Madani Philip Fairey FSEC/UCF Acct #20127051 Table of Contents Background ............................................................................................
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Effectiveness of Florida\u2019s Residential Energy Code: 1979 - 2009 (Revision of 1979 - 2007 Report) FSEC-CR-1806-09 Final Report June 15, 2009 Submitted to: Mo Madani Codes & Standards Office Florida Department of Community Affairs 2555 Shumard Oak Blvd Tallahassee, FL 32399-2100 DCA Contract #08-BC-28-12-00-22-002 (Mod 6) Submitted by: Philip Fairey FSEC/UCF Acct #20127051Code Effectiveness: 1979-2009 i Table of Contents 1 Background................................................................................................................. 1 2 Executive Summary.................................................................................................... 1 3 Methods....................................................................................................................... 3 4 Results......................................................................................................................... 8 4.1 Changes in Energy Code Stringency Over Time................................................ 8 4.2 Cumulative Energy Code Savings Over Time.................................................. 10 4.3 Impacts of Florida House Size Increase Over Time......................................... 13 4.4 Florida\u2019s Energy Code as Compared with the 2006 IECC............................... 14 4.5 Beyond Florida\u2019s 2007 Energy Code................................................................ 15 5 Recommendations..................................................................................................... 17 5.1 Make Florida\u2019s Energy Code Comprehensive. ................................................. 18 5.2 Revise Florida\u2019s Energy Code Baseline Home................................................. 20 List of Figures Figure 1 Comparison of Energy Code cycle stringency from 1979 - 2009. ...................... 8 Figure 2 Average Florida home savings resulting from Florida Energy Code implementation. ................................................................................................... 9 Figure 3 Cumulative Florida Residential Energy Code Savings over time. .................... 12 Figure 4 Florida s retail residential electricity cost from 1980 - 2009. ........................... 12 Figure 5 Cumulative cost savings from Florida Residential Energy Code for Building Construction. ...................................................................................................... 13 Figure 6 Impacts of house size takeback on Florida s Energy Code savings. .............. 14 Figure 7 Comparison of 2009 IECC requirements with 2009 Florida Energy Code. ...... 14 Figure 8 Cost of Conserved Energy (CCE) for an array of home improvements relative to Florida s 2007 Energy Code. .......................................................................... 16 Figure 9 RESNET s HERS Index scale. .......................................................................... 19 Figure 10 HERS Indices for 2007 Florida Energy Code homes located in six Florida climates. .......................................................................................................... 19 Figure 11 Changes in annual energy uses (and Energy Code energy budgets) if Baseline Home specifications are substantially strengthened. ...................................... 21 Figure 12 HERS Indices for 2007 Florida Energy Code homes compared with HERS Indices for much more stringent Baseline Home. ........................................... 22Code Effectiveness: 1979-2009 1 Effectiveness of Florida\u2019s Residential Energy Code: 1979 \u2013 2009 (Revision of 1979-2007 Report) Philip Fairey Florida Solar Energy Center June 15, 2009 1 Background More than 30 years ago, the 1973 oil embargo fundamentally changed the way we view energy resources. The 1973 Florida Legislature established the first Florida Energy Commission and the following year, at its recommendation, the Florida Solar Energy Center was established by the legislature. In 1978, the State Energy Office under the Department of Administration issued Florida\u2019s first statewide building Energy Code. Modeled after ASHRAE Standard 90-75, this code became effective in 1979 and from that point forward, Florida has successfully managed a statewide residential Energy Code, which consistently receives high marks in U.S. Department of Energy national code studies. In 2006, the retail price of gasoline and the wholesale price of natural gas increased dramatically, at one point exceeded $3.00 per gallon and $13.75 per million Btu, respectively. Energy resources are now \u201ctop of mind\u201d once again. Prices have declined, but not that much and retail gasoline prices are again pushing $3.00 per gallon. As a result, there is renewed interest in energy efficiency and renewable energy resources. More than 50% of Florida\u2019s electricity is used in our 8 million plus residences and the energy provisions of the Florida Building Code, hereinafter called theEnergy Code, are a key tool in achieving statewide increases in energy efficiency. 2 Executive Summary This study was commissioned by the Florida Department of Community Affair\u2019s Codes & Standards Section to determine the impacts of Florida\u2019s Energy Code over time and recommend possible changes that would increase residential efficiency. It examines each of the 15 residential Energy Code cycles that have occurred during the 30 year period and determines the relative change in Energy Code stringency and its impact on energy use and energy cost throughout the period. The study has been revised to include Florida\u2019s 2009 supplement to its 2007 Energy Code to determine how its requirements compare with the requirements of Section 405 of the 2009 International Energy Conservation Code (IECC). Florida\u2019s Energy Code compliance software, EnergyGauge\u00ae USA,1 1 Version 2.6.02 isCode Effectiveness: 1979-2009 2 used to conduct annual, hourly simulations and analysis of 180 different home configurations. These results are combined with Florida’s historical energy cost data and new home construction data to determine statewide energy use and cost changes across each Energy Code cycle and across all years since 1979. The change in median home size over the 30-year period is also considered by the analysis. The major findings of the study are: ã Florida has had considerable success using its Energy Code since 1979, increasing efficiency requirements by more than 65% and cumulatively saving Floridians more than 39 billion kWh of electricity – enough to power more than 3 million new Florida homes2 for a year. The cost savings have also been significant, estimated at almost $4.7 billion, cumulatively. Compared to the 1979 Energy Code, the estimated 67,000 new homes estimated to be built during 2009 will produce annual cost savings of more than $126 million per year. ã Florida’s 2009 Energy Code will likely result in new homes that are about 17% more efficient than homes built to the standards of the 2006 IECC and about 3% less than the 2009 IECC, which was just promulgated. ã Significant opportunities exist to cost-effectively increase residential energy efficiency, especially in new Florida homes. The American Council for an Energy Efficient Economy (ACEEE) recently completed a report on Florida’s energy use showing a significant potential to cost-effectively construct homes that are at least 30% more efficient than Florida’s 2007 Energy Code and 15% more efficient than Florida’s 2009 Energy Code.3 ã “Other” residential energy uses, which have not been considered by Florida’s Energy Code,4 constituted 28% of total home energy use in 1979. In 2009, the share of these “other” home energy uses has increased significantly to more than 55% of the total home energy use. ã Home sizes have consistently increased over time, from a median of 1736 ft2 in 1979 to a median of 2344 ft2 in 2009,5 taking back about 20% of the whole-home energy savings that would have been otherwise achieved. 2 Compliant with the proposed 2007 Florida Code. 3 Elliot, N., et.al, 2007. “Potential for Energy Efficiency and Renewable Energy to Meet Florida’s Growing Energy Demands.” ACEEE Report E072, American Council for an Energy Efficient Economy, Washington, DC. 4 Florida’s Energy Efficiency Code considers only heating, cooling and hot water energy uses. 5 Data derived from Florida Housing Data Clearing House, Shimberg Center, University of Florida, website: http://www.flhousingdata.shimberg.ufl.edu/
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