Heating and Cooling Equipment Efficiencies - Legacy System

In the detailed inputs level of the model, users can select the purchase year for their heating and cooling systems as an alternative to entering an efficiency value for the equipment. In these cases, we derive a shipment-weighted efficiency based on the purchase year of the equipment. A shipment-weighted efficiency is the average efficiency for all units sold within a particular year weighted by the number of units in each efficiency bin (AHAM 1996). Efficiencies for furnaces are measured as AFUE, or Annual Fuel Utilization Efficiency rating, which represents the seasonal or annual efficiency of the furnace. Heat pumps efficiency is shown as HSPF, Heating Seasonal Performance Factor.

The cooling efficiency for Central Air Conditioners and Electric Heat Pumps are rated by the seasonal efficiency of the equipment or SEER. Room Air Conditioners are rated by EER or Energy Efficiency Ratio, the ratio of the cooling output (in BTU) divided by the electrical energy consumption (in watt-hours).

Green shaded values did not have data available so the last available year is copied forward.

Yellow shaded values did not have data available so the first available year is copied backward.

Heating Equipment Efficiencies

Year
Gas
Furnace
(AFUE)
Electric
Furnace
(AFUE)
Oil
Furnace
(AFUE)
Propane
Furnace
(AFUE)
Gas
Boiler
(AFUE)
Oil
Boiler
(AFUE)
Heat
Pump
(HSPF)
Wall
Furnace
(AFUE)
1970 60.0 98 70.0 60.0 70.0 72.0 6.21 50.0
1971 61.4 98 71.8 61.4 71.2 73.6 6.21 54.8
1972 62.7 98 73.6 62.7 72.3 75.2 6.21 59.5
1973 62.7 98 73.6 62.7 72.3 75.2 6.21 59.5
1974 62.7 98 73.6 62.7 72.3 75.2 6.21 59.5
1975 65.8 98 73.6 62.7 72.3 75.2 6.21 59.5
1976 66.1 98 74.1 63.0 72.3 75.2 6.21 59.5
1977 66.4 98 74.5 63.3 72.3 75.2 6.21 59.5
1978 66.7 98 75.0 63.6 72.3 75.2 6.21 59.5
1979 68.7 98 75.5 64.8 72.3 75.2 6.21 59.5
1980 70.6 98 76.0 65.9 72.3 75.2 6.21 59.5
1981 70.4 98 76.8 67.1 77.4 77.4 6.21 63.1
1982 70.3 98 77.5 68.4 77.4 77.4 6.21 63.1
1983 70.1 98 78.3 69.6 77.4 77.4 6.20 63.1
1984 72.6 98 78.6 73.0 77.4 77.4 6.36 63.1
1985 72.9 98 78.6 73.8 77.4 77.4 6.39 63.1
1986 73.7 98 79.6 74.3 78.2 81.6 6.55 64.2
1987 74.3 98 79.8 75.1 78.2 81.6 6.71 64.2
1988 74.9 98 80.4 75.8 78.2 81.6 6.88 64.2
1989 74.7 98 80.4 75.5 79.7 83.1 6.92 65.6
1990 76.7 98 80.3 75.7 79.7 83.1 7.03 65.6
1991 77.5 98 80.8 76.9 79.7 83.1 7.06 65.6
1992 82.1 98 80.8 83.2 79.7 83.1 7.10 65.6
1993 82.4 98 80.9 83.8 79.7 83.1 7.10 65.6
1994 82.4 98 80.9 83.9 79.7 83.1 7.10 65.6
1995 82.3 98 80.9 84.1 79.7 83.1 7.10 65.6
1996 82.7 98 80.9 84.1 79.7 83.1 7.40 65.6
1997 82.9 98 80.9 84.1 79.7 83.1 7.10 65.6
1998 82.6 98 80.9 84.1 79.7 83.1 7.40 65.6
1999 82.6 98 80.9 84.1 79.7 83.1 7.40 65.6
2000 82.6 98 80.9 84.1 79.7 83.1 7.40 65.6
2001 83.1 98 80.9 84.1 79.7 83.1 7.40 65.6
2002 83.1 98 80.9 84.1 79.7 83.1 7.40 65.6
2003 83.5 98 80.9 84.1 79.7 83.1 7.40 65.6
2004 83.6 98 80.9 84.1 79.7 83.1 7.40 65.6
2005 83.9 98 80.9 84.1 79.7 83.1 7.40 65.6
2006 84.0 98 80.9 84.1 79.7 83.1 7.90 65.6
2007 84.1 98 80.9 84.1 79.7 83.1 7.90 65.6
2008 84.8 98 80.9 84.1 79.7 83.1 7.90 65.6
2009 84.8 98 80.9 84.1 79.7 83.1 7.90 65.6
2010 84.8 98 80.9 84.1 79.7 83.1 7.90 65.6

Cooling System Efficiencies

 Year Room
AC
(EER)
Central
AC
(SEER)
Heat
Pump
(SEER)
1970 5.80 6.50 5.50
1971 5.89 6.58 5.86
1972 5.98 6.66 6.21
1973 6.00 6.75 6.21
1974 6.10 6.85 6.21
1975 6.20 6.97 6.21
1976 6.40 7.03 6.87
1977 6.55 7.13 6.89
1978 6.72 7.34 7.24
1979 6.87 7.47 7.34
1980 7.02 7.55 7.51
1981 7.06 7.78 7.7
1982 7.14 8.31 7.79
1983 7.29 8.43 8.23
1984 7.48 8.66 8.45
1985 7.70 8.82 8.56
1986 7.80 8.87 8.70
1987 8.06 8.97 8.93
1988 8.23 9.11 9.13
1989 8.48 9.25 9.26
1990 8.73 9.31 9.46
1991 8.80 9.49 9.77
1992 8.88 10.46 10.60
1993 9.05 10.56 10.86
1994 8.97 10.61 10.94
1995 9.03 10.68 10.97
1996 9.08 10.68 11.00
1997 9.09 10.66 10.97
1998 9.08 10.92 11.29
1999 9.07 10.96 11.29
2000 9.30 10.95 11.21
2001 9.63 11.07 11.30
2002 9.75 11.07 11.31
2003 9.75 11.19 11.46
2004 9.71 11.29 11.56
2005 9.95 11.32 11.60
2006 10.02 13.17* 13.17*
2007 9.81 13.66 13.66
2008 9.93 13.76 13.76
2009 9.93 13.76 13.76
2010 9.93 13.76 13.76

* New federal CAC/HP standard took effect Jan 23, 2006. Standard level is 13 SEER. Because no SWEF data are available since 2003 that splits out CAC from HP, both products are set to the average for the combined product class (per AHRI data for DOE rulemaking).

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