Geothermal Heat Pump Cost: What Drives the Price

What you are paying for

A geothermal, or ground source, heat pump trades heat with the ground through buried pipe instead of with outdoor air. The quote covers two separate jobs:

The ground loop. Drilling or excavation, the pipe, the fluid, grouting, pressure testing, and restoring the yard. This is usually the largest part of the bill and the part that varies most from one property to the next.
The indoor system. The heat pump unit, the circulating pumps, connections to the loop, duct connections, electrical work, the thermostat and startup.

Permits add to it. Drilling and open-loop systems that use well water often need their own permits on top of the mechanical permit.

Loop type is the biggest price lever

Loop type	How it is built	Cost notes
Horizontal closed loop	Pipe laid in trenches a few feet deep	Lower cost per foot, but needs a lot of open land and tears up the yard
Vertical closed loop	Pipe set in deep drilled boreholes	Fits small lots. Drilling makes it the more expensive closed loop
Pond or lake loop	Coils sunk in a nearby body of water	Can be the least expensive, if you have suitable water close to the house
Open loop	Pumps well water through the unit and returns it	Lower loop cost where water supply, quality and local rules allow it

The installer should recommend a loop type after looking at your lot, your soil and rock, and local regulations. You cannot settle this from the house alone. It takes a site visit and often local drilling knowledge.

What else moves the price

System size. A larger heating and cooling load needs a bigger unit and more loop. The size should come from a load calculation.
Ground conditions. Hard rock, a high water table or unstable soil change the drilling time and method.
Site access. Drill rigs and excavators need room. Tight lots, slopes, septic fields and buried utilities complicate the work.
Existing ducts. Sound ducts can be reused. Homes with no ducts need them added, or need a system that heats water for radiant floors.
New build versus retrofit. Loops are easier to install before landscaping and driveways go in.
Extras. Hot water assist, zoning and backup heat strips.
Local market. Fewer geothermal installers and drillers work in some regions, which limits competition.

Geothermal versus air-source

Ground temperature a few feet down stays far steadier through the year than air temperature. A geothermal system works with that steady source, so it holds its efficiency in deep cold and high heat, has no outdoor unit to frost over and generally costs less to run. The loop is buried and has few moving parts.

The trade is the upfront price. An air-source system skips the ground work entirely, so its installed cost is much lower. The page on heat pump cost covers the air-source side. Geothermal makes the most sense when you plan to stay in the house for many years, have high heating and cooling bills now, and have a lot that suits a loop.

What a quote should include

Loop type, total loop length or number and depth of boreholes, and who does the drilling.
The load calculation and the unit's model number and capacity.
Duct, electrical and hot water work.
Permits, inspections and yard restoration.
Separate warranties for the loop, the unit and the labor.

Get more than one quote, and make sure each is based on a site visit. The heat pump overview compares the system types.

Common questions

Why does a ground source heat pump cost so much more to install?

The ground loop. Drilling boreholes or digging long trenches, laying and testing pipe and restoring the yard is heavy site work that an air-source system does not need. The indoor equipment costs more than a standard air handler too, but the loop accounts for most of the difference.

Does geothermal heating cost less to run?

Generally, yes. The ground stays at a steadier temperature than outdoor air, so the system works less hard in very cold and very hot weather. How much you save depends on your climate, your electric rate and the fuel you heat with now. Ask installers for an estimate based on your bills.

Can any home get a geothermal heat pump?

Not every home suits one. You need enough land for trenches or access for a drill rig, ground conditions that allow drilling, and local rules that permit the loop type. A site visit from a geothermal installer is the only way to find out what your lot allows.

Geothermal heat pump cost