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Geothermal Direct Use of Energy and Heat Pumps                                       
Table 3.4     xls   pdf   format      Renewable Energy Annual

Table 3.4.   Average Heating Efficiency for Geothermal Heat Pump Shipments, 2006
(Average COP)
Model Type 2006
ARI-320 4.4
ARI-325/330 3.9
Other (Non-ARI Rated) 3.4
COP=Coefficient of Performance
Note: One ton of capacity is equal to 12,000 Btus per hour. Efficiency is expressed as Btus of output per watthours of input. The higher the COP the more efficient the unit is.
Source: Energy Information Administration, Form EIA-902, "Annual Geothermal Heat Pump Manufacturers Survey."