The resulting energy use rates for residential buildings are expressed in terms of kilowatt-hours (kWh) of electricity and therms of natural gas per unit, by Census Division or individual state (including Arizona, Colorado, Florida, Georgia, Illinois, Massachusetts, Michigan, Missouri, New Jersey, New York, Pennsylvania, Tennessee, Texas, Wisconsin, and Virginia). For California, the default energy use rates are derived by dwelling unit type and building climate zone from the CEC RASS dataset. Figure 3 shows the CEC building climate zones, which correspond to the state's Title 24 building energy efficiency standards.