Geothermal Cost in Oklahoma by Job Type and Loop Type (2026)
Short answer: It depends most on whether a good loop is already in your yard. At Hartzell’s Heat & Air, most unit replacements on an existing loop run $20,000 to $25,000 (from 36 of my completed jobs), a rebuild starts at $3,500 installed, and a new loop is $17 a foot, sized from a heat load calculation. New-system estimates are free.
What does geothermal cost in Oklahoma by job type?
Three very different jobs hide behind the same question, and the price follows the loop:
- Your loop is good and the unit is tired: a geothermal rebuild starts at $3,500 installed, with up to a 5-year warranty when the loop verifies good. It can buy 8 to 10 years.
- Your loop is good and the unit is done: most unit replacements run $20,000 to $25,000. That range comes from 36 completed unit replacements in my records. The loop stays.
- No loop in the ground yet: a new system, with the loop at $17 a foot plus the unit, on a free written estimate.
The job records behind those numbers are laid out on what geothermal actually costs in Oklahoma, and the utility rebates and payment options are on geothermal heat pump cost, rebates and payment options.
I cover real Oklahoma geothermal pricing on my Ask Dave series. Watch it, then call 405-375-4822 for a free in-home estimate.
Which geothermal loop fits my Oklahoma property, and what drives its cost?
The loop is priced by the foot, and the footage comes from the heat load, not the size of the house. I run a heat load calculation using ASHRAE and ACCA Manual J methods on every system, then design the loop to carry that load. The property decides which type of loop makes sense:
| Loop type | Fits best | What moves the price |
|---|---|---|
| Horizontal closed loop | Farms and acreages with open ground to trench | Trench length for the load, soil, and how easy the ground is to work |
| Vertical closed loop | Town lots and tight sites | Bore depth and count, drilled by my OWRB-licensed driller |
| Pond loop | Property with a pond deep enough year-round | Distance from the house and the pond itself |
| Open loop (well water) | Strong well with good water quality | Well flow, water quality and where the water goes after |
I design the loop, size the system and stand behind the install. On a vertical loop, the bores are drilled by my OWRB-licensed driller.
Why does a geothermal unit replacement at Hartzell’s cost so much less than a new install?
“When I said replacement, that was the unit, not the loops.”Dave Hartzell, Hartzell’s Heat & Air, Kingfisher
The loop is the expensive part to put in, and once it is in, I do not dig it back up. A unit replacement ties new equipment into the pipe already in your yard, which is why it lands in that $20,000 to $25,000 range instead of carrying the loop footage. My records back that up: no loop field replaced in the 700+ geothermal jobs I have on file since 2017. If you are not sure whether your loop is good, a $348 diagnostic tells you before anybody prices a unit.
How long until geothermal pays for itself in Oklahoma?
Payback is the question I get right after price, and I do not put a year count on it, because nobody can honestly give you one without seeing your house and your bills. Four things drive it: what you heat with now, your electric rate, whether your utility pays a rebate on your kind of job (CKenergy, for one, pays on new installations and retrofits but ended its rebate for replacement units in 2026), and how long you stay. ClimateMaster advertises up to 80% savings over your existing heating and cooling system costs. That is ClimateMaster’s figure, not a promise from me. My geothermal fit check walks through the questions that matter for your place, and I put the installed price in writing at the free estimate so you can weigh it against your own bills.
What does Hartzell’s charge to price or check a geothermal system in Oklahoma?
A new-system estimate is free. On a system you already have, the geothermal diagnostic is $348 flat, weekday, night or weekend, and the same for my plan members, with a written report and a quote before I leave. Rebates depend on who sends your electric bill, so tell me your ZIP code and electric utility and I will check the current official program before I count any amount. I am IGSHPA Accredited and a ClimateMaster GeoElite dealer, with 4.8 stars and 300+ Google reviews, and I work geothermal across Oklahoma and most bordering states out of Kingfisher.
15+ years • 6,500+ jobs completed • 1,500+ Oklahoma homes served
Geothermal cost questions, answered
What does a geothermal job cost in Oklahoma by job type?
Three prices at Hartzell’s Heat & Air: a rebuild from $3,500 installed when the loop tests good; a unit replacement on an existing loop, most $20,000 to $25,000 from 36 of my completed jobs; and a new system, with the loop at $17 a foot plus the unit on a free written estimate.
Which geothermal loop is cheapest in Oklahoma?
It depends on the property. The loop is priced by the foot, and the footage comes from a heat load calculation. Horizontal loops need open ground to trench, vertical loops need drilled bores, and pond or well loops depend on the water. I price it after I walk the site.
How long until geothermal pays for itself?
I will not promise a payback year. It starts with your job type: a unit replacement on a good loop costs far less than a new system with a new loop, and CKenergy no longer pays its rebate on replacement units. Then your electric rate, what you heat with now and how long you stay. I put the installed price in writing at the estimate.
Do I need acreage to install geothermal?
No. A horizontal loop needs open ground, but a vertical loop fits a town lot. My OWRB-licensed driller drills the bores, and I design the loop, size the system and stand behind the install. A pond or a strong well can work too.
Can I find out if my old geothermal loop is good before I price a new unit?
Yes. At Hartzell’s Heat & Air the $348 geothermal diagnostic checks loop pressure, refrigerant charge, the desuperheater, controls and the heat exchanger, with a written report, before anybody prices a unit replacement.
What does a geothermal estimate cost in Oklahoma?
A new-system estimate is free. On an existing system, my geothermal diagnostic is $348 flat, any hour, and the same for plan members. Call 405-375-4822.
Sources
Prices are my current published prices and my own completed-job records. Outside figures are ClimateMaster’s and CKenergy’s, quoted as theirs, not my promise.