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Geothermal vs Air-Source Heat Pump Cost Calculator — 2026 Break-Even

See whether a geothermal (ground-source) or an air-source heat pump is actually cheaper over its life — weigh the higher up-front install against lower yearly running cost and find your break-even year.

Air-Source wins

$542 cheaper

Geothermal

$29,989

Air-Source

$29,447

Break-even

Year 22

Energy Need

MMBTU
30 MMBTU
160 MMBTU
yr
10 yr
30 yr

Electricity + Efficiency

$/kWh
0.05 $/kWh0.4 $/kWh
COP
3.5 COP6 COP
COP
2 COP4 COP

Geothermal Cost

$
15000 $40000 $
%
0 %30 %

Air-Source Cost

$
4000 $12000 $

Air-Source wins

Saves $542 over 20 years · breaks even in year 22

Geothermal

$29,989

Up-front$15,400
Per year$729
Best
Air-Source

$29,447

Up-front$6,000
Per year$1,172

Total cost over 20 years

Geothermal$29,989
Air-Source$29,447

Cumulative cost over time

Cumulative cost over time — crossover at year 22

What You'll Need

hOmeLabs 4,500 Sq Ft Energy Star Dehumidifier

$200-$2604.5
View on Amazon
Honeywell Home T9 Smart Thermostat with Sensor

Honeywell Home T9 Smart Thermostat with Sensor

$150-$2004.4
View on Amazon

Cooper & Hunter Mini Split AC 12000 BTU 22 SEER

$700-$9004.4
View on Amazon

hOmeLabs 4,500 Sq Ft Energy Star Dehumidifier

$200-$2604.5
View on Amazon
Honeywell Home T9 Smart Thermostat with Sensor

Honeywell Home T9 Smart Thermostat with Sensor

$150-$2004.4
View on Amazon

Cooper & Hunter Mini Split AC 12000 BTU 22 SEER

$700-$9004.4
View on Amazon

As an Amazon Associate, we earn from qualifying purchases.

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Example Calculations

1Typical home, average rates

Inputs

Annual heating + cooling80 MMBTU
Time horizon20 years
Electricity rate$0.14/kWh
EfficiencyGeothermal COP 4.5 / Air-source COP 2.8
Installed costGeothermal $22,000 (−30%) / Air-source $6,000

Result

Cheaper optionAir-source — saves $542 over 20 yrs
Geothermal 20-year total$29,989
Air-source 20-year total$29,447
Break-evenYear 21

Geothermal runs ~$729/year vs air-source ~$1,172 — a ~$443/year saving. But after the 30% federal credit geothermal still installs $9,400 higher ($15,400 vs $6,000), so it only breaks even at year 21, just past the 20-year horizon. Air-source edges it by ~$540.

2High energy load — geothermal wins

Inputs

Annual heating + cooling160 MMBTU
Time horizon20 years
Electricity rate$0.14/kWh
EfficiencyGeothermal COP 4.5 / Air-source COP 2.8
Installed costGeothermal $22,000 (−30%) / Air-source $6,000

Result

Cheaper optionGeothermal — saves $8,315 over 20 yrs
Geothermal 20-year total$44,578
Air-source 20-year total$52,893
Break-evenYear 11

Double the load and geothermal’s efficiency edge doubles too: ~$1,459/year vs ~$2,345 for air-source, a ~$886/year saving. The $9,400 install gap is recovered by year 11, and geothermal finishes ~$8,300 ahead. Big loads are where ground-source pays.

3No tax credit — break-even slips away

Inputs

Annual heating + cooling80 MMBTU
Time horizon20 years
Electricity rate$0.14/kWh
EfficiencyGeothermal COP 4.5 / Air-source COP 2.8
Installed costGeothermal $22,000 (no credit) / Air-source $6,000

Result

Cheaper optionAir-source — saves $7,142 over 20 yrs
Geothermal 20-year total$36,589
Air-source 20-year total$29,447
Break-evenYear 36 — beyond equipment life

Strip out the 30% credit and geothermal’s install jumps to the full $22,000 — a $16,000 gap over air-source. At ~$443/year savings, break-even pushes out to ~year 36, far beyond the equipment’s life, so air-source wins clearly by ~$7,140. The credit is what makes geothermal competitive.

Did You Know?

For a typical 80-MMBTU/year home in 2026, a geothermal heat pump (COP 4.5) runs about $729/year on $0.14/kWh power, versus about $1,172/year for an air-source unit (COP 2.8) — geothermal saves ~$443/year. But even after the 30% federal tax credit, geothermal still costs ~$9,400 more to install ($15,400 vs $6,000), so it only breaks even around year 21 — right at the edge of equipment life. Over 20 years the two totals land within ~$540 of each other, so air-source usually wins on value; geothermal pays off only with high energy loads, very long ownership, or extra local incentives.

Frequently Asked Questions

Q

Is geothermal cheaper than an air-source heat pump?

On running cost, yes; on total cost, usually not. Both move heat with electricity, but geothermal’s steady ground-source COP of 4–5 beats an air-source unit’s 2.5–3.5, so for a typical 80-MMBTU/year home it runs ~$729/year versus ~$1,172 — a ~$443/year saving. The problem is the buried ground loop: geothermal installs around $22,000, dropping to a net $15,400 after the 30% federal credit, versus $6,000 for air-source. That ~$9,400 up-front gap takes about 21 years to pay back at $443/year — right at the edge of equipment life — so air-source quietly wins on 20-year total cost in the typical case.

  • Geothermal running cost: ~$729/year (COP 4.5, $0.14/kWh)
  • Air-source running cost: ~$1,172/year (COP 2.8)
  • Geothermal saves ~$443/year but installs ~$9,400 higher
  • Break-even: ~21 years, even after the 30% federal credit
  • Air-source usually wins unless load is high or you stay 20+ years
SystemInstalledRunning / year20-Year Total
Geothermal (COP 4.5)$15,400~$729~$29,989
Air-source (COP 2.8)$6,000~$1,172~$29,447
Geothermal (no credit)$22,000~$729~$36,589
Q

How does the 30% federal geothermal tax credit work?

The federal Residential Clean Energy Credit returns 30% of the cost of a ground-source (geothermal) heat pump with no dollar cap, locked at 30% through 2032 before stepping down to 26% in 2033 and 22% in 2034. It is a tax credit, not a deduction — it cuts your tax bill dollar-for-dollar and rolls forward if it exceeds your liability in one year. On a $22,000 geothermal install that is $6,600 back, dropping the net to $15,400. Air-source heat pumps qualify only for the smaller 25C credit (30% up to a $2,000/year cap). Strip the geothermal credit out and break-even slips from ~21 years to ~36 — well beyond equipment life.

  • Residential Clean Energy Credit: 30% of cost, no cap
  • Locked at 30% through 2032, then 26% / 22%
  • $22,000 install → $6,600 back → $15,400 net
  • Credit (not deduction); rolls forward year to year
  • Air-source gets only the smaller $2,000-cap 25C credit
Q

When is geothermal worth the extra cost?

Geothermal wins when its yearly savings outrun the ~$9,400 higher install before the equipment wears out, and three levers tip it. High energy load magnifies the COP advantage: at 160 MMBTU geothermal saves ~$886/year and breaks even near year 11, finishing ~$8,300 ahead over 20 years. Long ownership helps because the ground loop lasts 50+ years while the heat pump lasts 20–25, so a household that stays put keeps collecting savings past break-even. And local incentives stacked on the federal 30% shrink the up-front gap. At an average 80-MMBTU load with a move inside 15 years, though, air-source is the smarter buy.

  • High load wins: 160 MMBTU breaks even ~year 11
  • Typical load (80 MMBTU): break-even ~year 21
  • Ground loop lasts 50+ yrs; long ownership favors geothermal
  • Stack state/utility rebates on the 30% federal credit
  • Short stay or modest load → air-source wins
Q

What is the difference between geothermal and air-source heat pumps?

Both heat and cool with electricity instead of burning fuel, but they pull heat from different places. An air-source heat pump exchanges heat with outdoor air, so its efficiency sags in extreme cold — a seasonal COP of 2.5–3.5 is typical. A geothermal (ground-source) heat pump exchanges heat with the stable ~50°F earth through a buried loop, holding a COP of 4–5 year-round regardless of weather. That steadiness is why geothermal runs cheaper, but the buried loop — trenching or drilling — is what makes it cost 3–4× more to install. An air-source unit installs in a day; geothermal needs excavation and can take a week.

  • Air-source trades heat with outdoor air (COP 2.5–3.5)
  • Geothermal uses the stable ~50°F ground (COP 4–5)
  • Geothermal COP holds in winter; air-source drops
  • Buried loop makes geothermal 3–4× costlier to install
  • Air-source: 1-day install; geothermal: excavation, ~1 week

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Last Updated: Jun 16, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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