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Appendix D U.S. Climate Zones for the 2003 CBECS Climate Zones Zone 1 is less than 2,000 CDD and greater than 7,000 HDD. Zone 2 is less than 2,000 CDD and 5,500-7,000 HDD. Zone 3 is less than 2,000 CDD and 4,000-5,499 HDD. Zone 4 is less than 2,000 CDD and less than 4,000 HDD. Zone 5 is 2,000 CDD or more and less than 4,000 HDD. SOURCE: http://www.eia.gov/emeu/cbecs/climate_zones.html [December 2011]. 103
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