如何计算Geothermal Heat Pump Savings
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The Geothermal Heat Pump Savings Calculator estimates annual heating and cooling cost savings from installing a ground-source heat pump system compared to conventional HVAC, accounting for the higher upfront cost and superior efficiency.
公式
Annual Savings = Conventional HVAC Annual Cost - Geothermal Annual Cost; where Geothermal Cost = Annual BTU Load / (COP x 3,412) x $/kWh
- COP
- Coefficient of Performance (dimensionless) — Ratio of heat output to electricity input; geothermal achieves 3.5-5.0 COP
- HL
- Heating Load (BTU/year) — Annual heating energy requirement for the building
- Ci
- Installation Cost ($) — Total cost including ground loop, heat pump unit, and ductwork
- ITC
- Investment Tax Credit (%) — Federal 30% geothermal tax credit under the IRA
分步指南
- 1Enter your home size, climate zone, and current HVAC system type and fuel costs
- 2The calculator estimates heating and cooling loads in BTU
- 3Compare conventional system costs (gas furnace + AC) to geothermal (COP 3.5-5.0)
- 4View annual savings, total installation cost, available 30% tax credit, and payback period
例题解析
输入
2,500 sq ft, 5,000 HDD, gas at $1.30/therm, electricity $0.14/kWh, replacing 92% AFUE furnace
结果
Conventional: $2,800/yr. Geothermal: $1,120/yr. Savings: $1,680/yr. Install: $25,000. After 30% ITC ($7,500): payback 10.4 years.
输入
3,000 sq ft, 6,500 HDD, propane at $3.00/gal (replacing propane furnace)
结果
Conventional: $4,200/yr. Geothermal: $1,400/yr. Savings: $2,800/yr. Payback: 6.3 years after ITC. Exceptional ROI.
常见错误注意事项
- ✕Not accounting for the 30% federal ITC for geothermal which can reduce a $25,000 system to $17,500 net cost
- ✕Comparing geothermal to cheap natural gas without considering that geothermal also replaces your AC system
- ✕Forgetting that geothermal systems last 25+ years (ground loop: 50+ years) vs 15-20 years for conventional systems
常见问题
How much does geothermal installation cost?
Typical residential systems cost $18,000-$35,000 installed. After the 30% federal ITC, net costs are $12,600-$24,500. Ground loop type (horizontal vs vertical) significantly affects cost.
Is geothermal worth it in warm climates?
Yes, geothermal provides efficient cooling too. In warm climates, the ground temperature (55-65F) is much cooler than summer air, giving geothermal a cooling advantage over air-source heat pumps.
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