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Scenario
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Base Case: 2,400-ft2 SFDU
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Move to 2,000-ft2 SFDU
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Move to 2,000-ft2 MFDU
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Energy use
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14,980 kW-h per unit per year (51.1 million Btu per unit per year)
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14,660 kW-h per unit per year (50 million Btu per unit per year)
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11,308 kW-h per unit per year (38.6 million Btu per unit per year)
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395.9 ccf ng per unit per year (40.7 million Btu per unit per year)
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366.7 ccf ng per unit per year (37.7 million Btu per unit per year)
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186.1 ccf ng per unit per year (19.1 million Btu per unit per year)
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Subtotal energy use
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92.8 million Btu per unit per year
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87.7 million Btu per unit per year
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57.7 million Btu per unit per year
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Energy savings
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—
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320 kW-h (1.1 million Btu) per unit per year
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3,671 kW-h (12.5 million Btu) per unit per year
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—
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29.2 ccf ng (3.0 million Btu) per unit per year
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209.8 ccf ng (21.6 million Btu) per unit per year
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Subtotal energy savings
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4.1 million Btu per unit per year
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34.1 million Btu per unit per year
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CO2 emissions
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24,705 lb per unit per year (11.2 metric tons per unit per year)
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23,935 lb per unit per year (10.9 metric tons per unit per year)
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17,330 lb per unit per year (7.9 metric tons per unit per year)
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CO2 emissions savings
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—
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770 lb (0.35 metric tons) per unit per year
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7,376 lb (3.3 metric tons) per unit per year
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Note: Btu = British thermal units; ccf ng = hundred cubic feet of natural gas; kW-h = kilowatt-hours; MFDU = multifamily dwelling unit; SFDU = single-family dwelling unit. Factors for converting energy figures to Btu: 1 kW-h of electricity = 3, 412 Btu; 1 cf of natural gas = 1,028 Btu; 1 ccf of natural gas = 102,800 Btu; 1 gallon of gasoline = 124,000 Btu. Factor for converting CO2 emissions to metric tons: 1 metric ton of CO2 emissions = 2,204.6 lb.
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