Almost nobody in this trade will put a geothermal number in front of you without a sales visit first. I am going to, because the most common question people ask about geothermal is what it costs, and dodging it wastes your time and mine. If you would rather see the number as a monthly payment than as a project total, that is what geothermal costs per month in Oklahoma.

These are not brochure numbers. They come off my own completed jobs.

The three ways this goes

If your loop is good and the unit is tired

Rebuild, from $3,500

A rebuild reuses the expensive part you already paid for, the loop in the ground, and puts the system back in service. It buys eight to ten years against a full replacement. When the loop verifies good, geothermal rebuilds carry up to a five year warranty. I also pulled ten years of Oklahoma electricity rate history from the federal filings, so you can see what power has actually done around here.

The common one, the unit only. Your loop stays

Unit replacement, most run $20,000 to $25,000

This is the job I do most often, and it is the unit only. New geothermal equipment tied into the loop already in your yard. The loop stays where it is. We do not replace loops, they last. I have loops in the ground out there that are on their third generation of equipment. Same pipe, third unit. That range is the real spread across 32 completed unit replacements in my own records, and the median on the ones since 2023 is $22,734. Some come in under and some run over, depending on tonnage, ductwork and what the electrical needs.

No loop in the ground yet

New system, the loop is $17 a foot

A brand new geothermal system means putting a loop in the ground, and that is what makes the number bigger. The loop runs $17 a foot, and how many feet you need depends on the size of the system, your soil, and whether we trench a horizontal field or drill vertical bores. I size that to your house rather than off a chart, so the total goes on a written estimate. Estimates on new systems are free. If you already have a well, the loop field may come off the estimate altogether: farm and ranch geothermal.

Where these numbers come from

The replacement range is measured from completed jobs in my own system, not from a price book and not from a national average. Thirty two geothermal replacements, fifteen of them since 2023. I am showing you the middle of my own book.

One thing that range tells you honestly: geothermal pricing moved. My median replacement was around $16,000 in 2021 and about $22,700 today. Equipment costs went up for everybody. It has been roughly flat the last three years.

What is not in the price

There is no federal tax credit to subtract. Do not let anyone show you a geothermal price that is only affordable after a credit. Check current IRS and ENERGY STAR guidance and talk to your own tax preparer before you count on anything.

Utility and co-op rebates are a separate thing and they change by provider and by program date. Tell me your ZIP and your electric utility and I will check the current official program before anybody quotes you a number. I will not guess on a rebate.

If the number is the problem

Two honest options. A lease puts a complete system in with nothing down and the loop inside one monthly payment, and I stay your service company for ten years. Or financing, through Synchrony, Wells Fargo, Wisetack, Klarna or JB Financing. Financing covers repairs and maintenance plans too, not just new systems.

What a service call costs

Separate from installs. A geothermal diagnostic is $348 flat, weekday or after hours, same number either way. That is a full performance audit, loop pressure, refrigerant charge, desuperheater, controls and heat exchanger, with a written report and a quote before I leave. A geothermal tune up is also $348.

Common questions

How much does a geothermal system cost in Oklahoma?

A replacement on an existing loop most often runs $20,000 to $25,000, measured across 32 of my own completed jobs, with a 2023 and later median of $22,734. A new system also needs a loop, which is $17 a foot sized to your house. A rebuild of an existing system starts around $3,500.

How much does a geothermal ground loop cost?

$17 a foot. How many feet depends on system size, soil and whether we trench horizontally or drill vertical bores, so I size it to your house and put the total in writing.

Is it cheaper to replace just the geothermal unit?

Usually yes, by a wide margin, because the loop is the expensive part and a good loop does not need replacing. In 727 geothermal jobs I have never replaced a loop field, and I have loops still working on their third generation of equipment.

Do I get a tax credit on geothermal?

Do not count on a federal credit. Check current IRS and ENERGY STAR guidance and ask your tax preparer. Utility rebates are separate and vary by provider, and I will check your specific program before quoting anything.

Why is geothermal more expensive than a regular system?

The loop. Everything else is comparable, but a geothermal system needs pipe in the ground before you own any equipment. That is also why a replacement on an existing loop is so much cheaper than a first install.

Do you charge for a geothermal estimate?

No. Estimates on new systems are free. A diagnostic on a system that is already broken is $348 flat and comes with a written report.

Want a real number for your house?

Estimates on new systems are free. Tell me your town, your system size and whether you already have a loop.

Call 405-375-4822 or book a free estimate.