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Figure 3‐4: Installed‐Cost Estimates for Residential GSHPs vs. Heating Efficiency 8000 6000 4000 2000 0 0123456 Heating Efficiency (COP) E IA Department ofDefense Rafferty Figure 3‐5 shows the approximate breakdown of GSHP cost by major component. The ground loop is the single most expensive component, accounting for about 30 to 35 percent of the installed cost (depending on whether the ductwork is included). Henderson reports that ground loops for four demonstration homes in New York State cost between $1000/ton and $1800/ton6 [Henderson 1998]. If we assume this is 35.5 percent of the installed cost, then the associated installed costs would range from $2800/ton to $5100/ton, which is not inconsistent with the installed cost we used ($3000/ton for a typical‐efficiency GSHP). Figure 3‐5: Approximate GSHP Cost Breakdown by Component 6 Two homes used direct-exchange ground loops (refrigerant flows through ground loop). Report was written in 1998, so costs are dated. Also, costs for demonstration projects may not reflect typical costs. U.S. Department of Energy 35 Installed Cost/Ton ($/ton)PDF Image | Ground‐Source Heat Pumps
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