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Figure 3‐3: Installed‐Cost Estimates for Residential ASHPs vs. Heating Efficiency 25 00 20 00 15 00 10 00 500 0 0 2 4 6 8 10 12 Heating Efficiency (HSPF) EIA Rafferty Kavanaugh and Rafferty also provided estimates for the combined installed cost of a gas furnace and conventional 3‐ton air‐conditioning system: • Kavanaugh 1995: $4300 (in $1995) • Rafferty 2008: $6200. Comparing these estimates to EIA’s (Table 3‐1 above), we would estimate and installed cost of about $4200, based on a: • 75‐kBtuh gas furnace (capacity assumed) at $24.00/kBtuh: $1800 • 3‐ton air conditioner at $814/ton: $2400 • Total : $4200. For reasons similar to those outlined above for ASHP costs, we elected not to use the Kavanaugh and Rafferty estimates. Figure 3‐4 compares installed‐cost estimates for residential GSHPs (as a function of rated heating efficiency) from various sources. Most estimates are for GSHPs having 3‐ton nominal cooling capacities. For reasons similar to those outlined above for ASHP costs, we elected not to use the Kavanaugh and Rafferty estimates. While DOD has a substantial installed‐cost database, their average costs seemed suspiciously high given the large contracts let—many were to install hundreds of residential heat pumps [DOD 2007]. We do not know if DOD had special provisions that contributed to the costs. U.S. Department of Energy 34 Installed Cost/Ton ($/ton)PDF Image | Ground‐Source Heat Pumps
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