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Table 3. Potential Efficiency Gains, and Energy and Carbon Emission Savings, of Replacing Existing 1997 Appliances
  Refrigerator Freezer Room AC Central AC Natural Gas
Space Heat
Natural Gas
Water Heat
1997 Stock Efficiencies (1992 = 100) 1.32 1.14 1.16 1.11 1.04 1.09
1997 Consumption (Tbtu) 437 125 68 320 3347 1061
1997 Carbon Emissions (MMTC) 21.7 6.2 3.4 15.9 48.2 15.3
  Replacing All of 1997 Stock
Efficiency (1992 = 100) 1.8 1.76 1.27 1.29 1.22 1.15
Efficiency Gain 36% 54% 9% 16% 17% 6%
Energy Savings (TBtu) 159 68 6 52 579 58
Carbon Savings (MMTC) 7.9 3.4 0.3 2.6 8.3 0.8
  Replacing 1997 Stock 10 Years or Older
Efficiency (1992 = 100) 1.67 1.67 1.26 1.25 1.18 1.14
Efficiency Gain 27% 46% 9% 13% 13% 5%
Energy Savings (TBtu) 116 58 6 40 451 49
Carbon Savings (MMTC) 5.8 2.9 0.3 2.0 6.5 0.7
  Potential Savings from These Appliance Replacements  
  1997 Stock Replaced All   1997 Stock Replaced 10 Yrs.+  
  Energy Savings (TBtu) 923   Energy Savings (TBtu) 720  
  Carbon Savings (MMTC) 23.4   Carbon Savings (MMTC) 18.1  
Sources: Energy Information Administration, 1997 Residential Energy Consumption Survey; Jim McMahon, Lawrence Berkeley National Laboratory, unpublished data.

[Trends in Building-Related Energy and Carbon Emissions]

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Stephanie Battles
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File Last Modified: September 14, 2000