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New York Energy Resource Bureau
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Source quality: Secondary

Geothermal Heat Pump Buyer's Guide

Equipment type: Ground-source (geothermal) heat pumps Last reviewed: May 27, 2026 Source quality: Secondary

What this equipment is

A geothermal heat pump moves heat between your house and a closed loop of fluid buried in the ground. The ground a few feet below the surface holds a near-constant temperature year-round (roughly 50°F in most of New York), which gives a geothermal system a far more stable heat source in winter and heat sink in summer than the outdoor air a conventional air-source heat pump pulls from. The result is higher efficiency, lower operating cost, and steadier performance on the coldest and hottest days.

That higher efficiency comes at an install cost that is meaningfully larger than air-source. The indoor equipment is similar in price to a high-end air-source unit, but the ground loop requires either trenches (horizontal loops) or boreholes (vertical loops) drilled by a licensed contractor. Yard disruption, drilling cost, and site assessment make geothermal a niche residential install in New York: most installs go in on larger lots, during a major renovation, or on a new build where the equipment cost can be folded into construction financing.

The trade-off is straightforward. If you have the land, the budget, and a plan to stay in the house long enough to recover the install cost, geothermal beats air-source on operating cost and life expectancy. If you have a tight lot or a short stay horizon, air-source is almost always the right call.

Programs that apply

Geothermal rebate stacks in New York are stronger than air-source stacks, because the state and several utilities have published a separate higher-tier rebate for ground-source equipment.

  • NYS Clean Heat. The state heat pump program pays a higher rebate tier for ground-source systems than for air-source. The rebate is paid through your installer at install time.
  • NY State Geothermal Credit. A state income tax credit specifically for ground-source heat pump systems. Air-source installs do not qualify for this credit.
  • Central Hudson Residential Rebates. Central Hudson publishes a higher rebate tier for geothermal than for air-source in its residential program.
  • PSEG Long Island Rebates. PSEG Long Island recently verified a substantial geothermal rebate, with a higher tier available for income-qualified households.
  • NYSERDA Residential Financing. State-backed loan products that can cover the unrebated portion of a geothermal install, including the loop work.
  • EmPower+. Income-qualified households may receive heat pump installs at no or low cost through EmPower+. Whether a ground-source install is in scope depends on case-by-case program review and site feasibility.

Sequencing your project

Geothermal sequencing differs from air-source in one critical way: the loop work has to be planned before the indoor equipment is sized, because the loop type drives both cost and feasibility.

  1. Site assessment for loop feasibility. Before anything else, a qualified installer or driller walks your property and confirms which loop type works. A horizontal loop needs roughly half an acre of accessible yard. A vertical loop needs drilling access for a rig and a clear path for boreholes. Properties with underground utilities, ledge close to the surface, or restrictive setbacks may rule out one loop type.
  2. Envelope work first. As with any heat pump install, a leakier house needs a larger system, which means a larger and more expensive loop. Air-sealing and insulation work done before the load calculation directly shrinks the loop you have to dig.
  3. Manual J load calculation. The contractor performs a Manual J calculation on the post-envelope home. Manual J is the industry-standard heating and cooling load calculation, and the loop length is sized off the result. Skipping Manual J on a geothermal install is a far more expensive mistake than on an air-source install.
  4. Loop type and well or trench plan. The installer specifies horizontal trench layout, vertical borehole count and depth, or (rarely) an open-loop well design. The plan should include the heat exchanger fluid (typically methanol or propylene glycol mix), pipe material (HDPE is standard), and grout specification for vertical bores.
  5. Permits and regulatory check. Open-loop systems that draw and discharge groundwater fall under state and sometimes county environmental regulations. Closed-loop systems still need building and well permits in most jurisdictions. A driller experienced in residential geothermal handles these filings.
  6. Certified driller and installer selection. Get at least two quotes from contractors registered in the Clean Heat program and credentialed for ground-source work (IGSHPA certification is the common credential). Inexperienced drillers are the single biggest source of failed geothermal installs.
  7. Install and commissioning. The loop is installed, pressure-tested, and connected to the indoor heat pump and distribution system. Commissioning includes a flow test, refrigerant charge verification, and a heat-of-extraction check at design conditions.

Loop type guidance

The loop is the most site-specific part of a geothermal install. Four common configurations exist; in New York residential, two of them dominate.

  • Horizontal closed loop. Trenches dug 4 to 8 feet deep over a large area. The cheapest option per BTU when you have the land. Needs roughly 400 to 600 feet of trench per ton of capacity, depending on soil and depth.
  • Vertical closed loop. Boreholes drilled 200 to 500 feet deep, typically one bore per ton. Far more flexible siting, since you can fit a vertical loop under a much smaller footprint, but per-foot drilling cost is high.
  • Open-loop (groundwater) system. Draws water from a well, runs it through the heat exchanger, and discharges it back to a second well or a surface body. Efficient and cheaper than a closed vertical loop where conditions allow, but state and county groundwater discharge rules apply, and water quality testing is required.
  • Pond or lake loop. A closed loop submerged in a body of water on the property. Rare in New York residential outside of a few lakefront sites.

What to look for in equipment

The indoor heat pump unit and the loop have to be matched. A few specs cover the equipment side.

  • COP (Coefficient of Performance). The ratio of heat delivered to electricity consumed. Geothermal units routinely hit COP values of 4.0 to 5.0 at standard rating conditions, well above what air-source units deliver.
  • EER (Energy Efficiency Ratio). The cooling-side efficiency metric for geothermal. Higher is better.
  • ENERGY STAR certification. ENERGY STAR-certified geothermal heat pumps meet a higher COP and EER threshold than the federal minimum. The certification is the right baseline filter.
  • Two-stage or variable-speed compressor. Single-stage units are loud and short-cycle on part loads. Two-stage and variable-speed compressors run longer at lower output, which improves comfort and efficiency.
  • Desuperheater option. A desuperheater is a small heat exchanger that uses waste heat from the geothermal cycle to preheat domestic hot water. It is a relatively low-cost add and pays back quickly in heating-dominant climates.
  • Loop sizing margin. The loop should be sized for the design heating load with a small margin, not undersized in a bid-cheapening shortcut. An undersized loop forces the heat pump to work harder against a depleted ground temperature, which kills both efficiency and equipment life.

What to ask your contractor

  • Are you registered with the NYS Clean Heat program, and do you hold an IGSHPA accreditation for ground-source installs?
  • Who is doing the drilling, and how many residential geothermal loops have they completed in New York?
  • Did you perform a Manual J calculation on this home, and can I see the output?
  • What loop type are you proposing, and why is it the right one for my site?
  • What is the loop length or borehole depth in feet, and how was that number calculated against the Manual J load?
  • For an open-loop proposal: what is the discharge plan, and have you confirmed compliance with state and county groundwater discharge rules?
  • Will the rebate be processed at install time and deducted from my invoice, or paid separately?
  • What is the commissioning protocol, including flow test, pressure test, and entering-water-temperature verification at design conditions?

Common pitfalls

  • Under-sized loop. The most common geothermal failure. An undersized loop progressively depletes the ground temperature around the pipes, which lowers efficiency every year. The result is a system that performs to spec on day one and falls off by year three.
  • Wrong loop type for the site. A horizontal loop on a rocky lot with shallow ledge ends up costing more than a vertical loop would have. A vertical loop drilled into fractured rock can have unexpected grouting and water-loss problems. The site assessment exists to catch this before the dig.
  • Inexperienced driller. Residential geothermal drilling is a specialty. A general well driller who has not done geothermal loops often produces bores with poor heat transfer, bad grout contact, or fluid leaks. Ask for references on past residential geothermal jobs specifically.
  • Open-loop discharge permits ignored. Open-loop systems that discharge groundwater without the right permits can become a regulatory problem at resale or during a property transfer. Confirm permits before drilling.
  • No envelope work. Same trap as air-source, with a steeper penalty: a leaky house drives a larger loop, and the loop is the expensive part. Do envelope work first.
  • No commissioning report. A geothermal install without a written commissioning report leaves you with no baseline if the system underperforms in year two. Insist on a documented commissioning package.

Source

NYSERB.com is an independent research site. It is not affiliated with NYSERDA, the NY Department of Taxation and Finance, IGSHPA, the State of New York, or any utility. Verify all program details and incentive amounts directly with the relevant program administrator before making any financial decision.

Verified against www.nyserda.ny.gov, www.tax.ny.gov, www.energystar.gov on May 27, 2026.

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