Geothermal heat pump cost calculator

How much does a geothermal heat pump cost installed?

Residential geothermal heat pump systems run $18,000 to $45,000 fully installed for a typical 2,000 to 3,000 sqft home. Per-ton installed cost averages around $8,500, with a range of $4,500 to $12,500 per ton depending on loop type, soil conditions, and local drilling rates. The system splits into three cost buckets:

• Indoor equipment (heat pump unit + controls): $1,500 to $2,500 per ton
• Loop field (drilling or excavation): $5,000 to $20,000 depending on loop type
• Labor, permits, ductwork tie-in: typically 25 to 30 percent of materials

Vertical closed-loop systems average $22,000 to $35,000 installed for a 3-ton unit. Horizontal loops cost 20 to 30 percent less where lot size allows. Pond loops are the cheapest at $15,000 to $25,000 if you have an existing 0.25+ acre water body deep enough to stay unfrozen year-round.

Geothermal sizing: 1 ton per 500 sqft as the starting point

Geothermal systems size at roughly 1 ton of capacity per 500 sqft of conditioned space, with adjustments for climate, insulation, and how well your existing ductwork can move the air. The math gets tighter than air-source sizing because geothermal equipment is more expensive per ton, and oversizing wastes drilling money you can never get back.

• 1,500 sqft home, Zone 4, average insulation: 3 tons
• 2,000 sqft home, Zone 5, average insulation: 4 tons
• 2,500 sqft home, Zone 6, good insulation: 4 to 5 tons
• 3,000 sqft home, Zone 7, excellent insulation: 5 tons
• 3,500 sqft home, Zone 5, average insulation: 7 tons (split into 2 units)

Residential geothermal comes in 2, 2.5, 3, 3.5, 4, 5, and 6 ton sizes. Above 6 tons, most installers split into two smaller units running on a common loop field, which gives you redundancy and stage-down capacity for shoulder seasons. The calculator above auto-rounds to the next standard tonnage.

Vertical vs horizontal loop: which one fits your lot?

The single biggest cost driver in any geothermal install is the loop field, which is where your installer either drills vertical boreholes or digs horizontal trenches in your yard. The choice depends on your lot size, soil conditions, and existing landscaping.

• Vertical loops: 150 to 235 ft of pipe per ton in average soil. Boreholes go 100 to 400 ft deep, typically clustered in a small area. Best for small lots, mature landscaping, and rocky/clay soils where horizontal trenching would be a nightmare. Most expensive at $15 to $25 per drilled foot.
• Horizontal loops: 400 to 780 ft of trench per ton. Requires 1,500 to 3,000 sqft of accessible yard per ton. Trenches dig 4 to 6 ft deep. Cheapest install method at about $8 per trench foot, but tears up the entire loop area during installation.
• Pond loops: Coils of HDPE pipe sunk into an existing pond at least 8 ft deep and 0.25 acres in size. Cheapest of all if you have the water body. Heat transfer is excellent because water moves around the coils.

For most suburban lots under half an acre, vertical loops are the only practical option. Rural lots with 2+ acres of clear yard usually go horizontal because the trenching is much cheaper than drilling. The calculator above lets you toggle between the three and see the cost difference for your specific home size.

Soil type and why drilling cost varies $10 per foot

Soil conditions matter for two reasons: heat transfer efficiency (better soil contact means shorter loops) and drilling difficulty (harder soil means slower drilling and higher cost per foot). The same 3-ton system can need 465 ft of pipe in dense rock or 705 ft in dry sand for the same heating and cooling output.

• Dense rock or wet clay: 155 to 175 ft per ton vertical, drilling $20 to $25 per ft
• Average soil: 200 ft per ton vertical, drilling $18 to $22 per ft
• Dry sand or disturbed soil: 220 to 235 ft per ton vertical, drilling $15 to $20 per ft

The dense rock case looks expensive on per-foot drilling but pays back through shorter total loop length. Wet clay is the sweet spot: high heat transfer means short loops, and clay drills faster than rock. Most installers will do a test drill before quoting a full system, which costs $500 to $1,500 and tells you exactly which scenario applies on your property.

Geothermal operating cost: 30 to 60 percent less than air-source

The reason homeowners pay the geothermal premium is the operating cost. Ground temperature stays between 50 and 70°F year-round below the frost line, which means the heat pump always has a moderate source/sink temperature to work against. Air-source heat pumps lose efficiency fast below 30°F outdoor; geothermal does not.

• Zone 4 mixed climate: geothermal saves 30 to 35 percent vs air-source
• Zone 5 cool climate: geothermal saves 40 to 50 percent vs air-source
• Zone 6 cold climate: geothermal saves 50 to 60 percent vs air-source
• Zone 7 very cold: geothermal saves 60 to 70 percent vs air-source

For a 2,500 sqft Zone 5 home, geothermal annual electricity runs $1,000 to $1,400 against $1,700 to $2,200 for an equivalent air-source heat pump. Over a 25-year equipment lifespan, that's $15,000 to $20,000 in operating cost savings. The savings don't fully pay back the $15,000 to $20,000 install premium in most cases, but the gap closes quickly in cold climates and in regions with cheap electricity.

State and utility rebates that still apply to geothermal

Roughly 20 states still run geothermal incentive programs separate from any federal credit. The largest are New York's NYSERDA geothermal heat pump program, Massachusetts' Mass Save rebates (heat pump programs include ground-source), and Maryland's geothermal grant program. Smaller state and utility programs in Connecticut, Vermont, Minnesota, and Oregon also pay $1,500 to $5,000 toward a residential geothermal install. Use the rebate finder to check current values in your state before signing any quote.

A second pathway is the Section 48 commercial investment tax credit, which is still active and which some geothermal installers are using to set up lease or PPA arrangements where a third-party corporate owner takes the credit and passes savings to the homeowner through a lower monthly rate. These structures are new for residential geothermal and worth asking your installer about. They change the ownership model significantly, so read the contract carefully on exit terms before signing.

Carrier, Trane, WaterFurnace, ClimateMaster: which brand to buy

The major US residential geothermal brands are WaterFurnace, ClimateMaster, Bosch, Trane, and Carrier. WaterFurnace and ClimateMaster are the original geothermal-only specialists and have the deepest contractor network. Bosch entered the residential market through their HVAC division. Trane and Carrier sell rebadged units (mostly built by ClimateMaster or WaterFurnace under their respective brand badges).

For a standard 3 to 5 ton residential install, WaterFurnace Series 7 and ClimateMaster Trilogy are the premium variable-speed inverter units that deliver the highest COP and the quietest operation, priced around $12,000 to $14,000 for the indoor unit alone before loop field. The mid-tier WaterFurnace Series 5 and ClimateMaster Tranquility 27 are the value sweet spot at $7,000 to $9,000 indoor unit cost with two-stage compression. Bosch SM and Trane EXM compete in the same value tier with similar specs.

Is geothermal worth it for your home? The honest math

Geothermal pays back well in three specific scenarios: cold climates (Zone 5 and colder) with high heating loads, expensive electricity markets, and homes you plan to own for 15+ years. Outside those, the math is harder to justify on operating cost alone. The decision framework most installers use:

• Cold climate + 20-year ownership + 0.5+ acre lot: geothermal usually wins
• Mixed climate + 10 to 15 year ownership: case-by-case, run the numbers
• Hot climate (cooling-dominated): air-source heat pump usually wins on payback
• Short ownership (under 10 years): geothermal rarely pays back, ASHP is the answer
• State or utility rebate available: payback windows shorten 2 to 5 years

Before you sign any quote, run our air-source heat pump sizing calculator on the same home and compare 25-year total cost honestly. For most US homeowners today, a high-efficiency air-source heat pump (Mitsubishi Hyper-Heat, Carrier Infinity, Trane XV20i) delivers 85 to 90 percent of geothermal's operating cost advantage at one-third the installed price. Geothermal is the right answer when you are confident you will be in the home long enough to amortize the loop field across decades.