Best Geothermal Company in Oklahoma | Hartzell’s Heat & Air

I’m Dave Hartzell. I’ve been turning wrenches on HVAC systems for 45 years, and I designed my first geothermal system in central Oklahoma in the early 1990s, before most contractors out here had ever heard of a ground source heat pump. I’m IGSHPA Accredited, ClimateMaster GeoElite Dealer, Mitsubishi Diamond Dealer, BBB A+ for 11 years running, and was named to Marquis Who’s Who in America 2026 for my work building geothermal in Oklahoma. The reason most geo systems underperform isn’t the equipment, it’s the loop field. I pursued IGSHPA Accreditation specifically because it covers loop design, and I size every job with a Manual J load calc before I quote anything. That’s the difference between a system that runs at 400 percent efficiency for 25 years and one that limps along undersized. I install for homeowners across Kingfisher, Edmond, El Reno, Yukon, Mustang, Enid, Watonga, Guthrie, and the rest of central and western Oklahoma. I also build commercial geo, 200 to 300 ton grow-house loop fields included. Background: how geothermal heat pumps work.

Residential geothermal installs run $24,000 to $45,000 before Oklahoma utility rebates. With CKenergy at $2,000 per ton (max $24,000), OG&E at $1,000 per ton, or Cimarron Electric at $600, your net cost drops significantly. Free estimates, no email required. Call 405-375-4822, see the full 2026 rebate matrix, or check HVAC financing options for Oklahoma (0% APR available on qualifying jobs).

Related reading: CKenergy rebate-eligible counties.

Related reading: geothermal ROI in Oklahoma.

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Watch: Geothermal Loop Field Drilling in Oklahoma

Most homeowners never see what happens underground. These two videos show my crew drilling and installing a closed-loop geothermal system in central Oklahoma, start to finish.

Why I’m the Right Geothermal Installer in Oklahoma

There are plenty of HVAC contractors in Oklahoma who will sell you a geothermal system. There are very few who have the training to design the loop field correctly, and even fewer who have done it for 30-plus years. Here is what I bring to your install:

• IGSHPA Accredited Installer. The International Ground Source Heat Pump Association accreditation is the gold standard for loop design. Loop undersizing is the number one reason geothermal systems underperform, and IGSHPA is the only training that drills it into you correctly.
• ClimateMaster GeoElite Dealer. ClimateMaster is the largest geothermal manufacturer in North America. GeoElite is their top dealer tier, reserved for installers with proven competency on Tranquility and Genesis series equipment.
• Marquis Who’s Who in America 2026. Recognized for contributions to geothermal HVAC in Oklahoma. Read the press release.
• 45 years of HVAC experience. I started at 18, I’m 63 now. I’ve worked on every kind of system Oklahoma weather throws at HVAC, and geothermal has been my focus since the early 1990s.
• Master HVAC license, NATE certified, Mitsubishi Diamond Dealer, Trane TCS SELECT, Amana Brand Advantage Dealer. Credentialed across every major HVAC discipline, not just geo.
• BBB A+ rating for 11 straight years. 4.8 stars across 276 customer reviews.
• Commercial geothermal experience. I’ve designed and installed 200 to 300 ton loop fields for Oklahoma grow houses and commercial facilities. Same principles apply to your house, just bigger.
• I own the equipment. No subcontractors for the loop field. My crew runs the drill rig, the trencher, and the fusion machine. If something goes wrong with the loop in year 12, there is one person to call: me.
• I handle the rebate paperwork. AHRI certificate, contractor license, IGSHPA credentials, completed utility application. Free of charge.

What Makes Geothermal Different

Every other heating and cooling system, gas furnace, air conditioner, air-source heat pump, fights against the outdoor climate. Geothermal ignores it. The system exchanges heat with the earth, which stays a stable 55 to 60 degrees year-round in central Oklahoma regardless of whether it’s 108 in August or 8 during an ice storm.

The result: 300 to 500 percent efficiency in both heating and cooling, year-round (see the U.S. Department of Energy on geothermal heat pumps). One system instead of separate heating and cooling equipment. Operating costs run 40 to 60 percent lower than conventional HVAC.

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Loop Field Types I Install

The loop field is the buried pipe network that exchanges heat with the earth. The right type depends on your property. I figure this out during the free estimate visit.

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My Installation Process

1. Free property assessment. I walk your lot, review your utility bills, ask about your goals, and figure out which loop type fits your property.
2. Manual J load calculation. Before I size equipment, I calculate your home’s actual heating and cooling load. A properly sized geothermal system performs correctly. Oversized or undersized does not.
3. Loop field design. I design the loop to match the system size, soil conditions, and available space. This is where IGSHPA training matters. Loop undersizing is the most common geothermal install failure in Oklahoma.
4. Permit and utility coordination. I pull the necessary permits and confirm your rebate eligibility with your utility (CKenergy, OG&E, Cimarron, OEC, KPWA, CVEC) before any work begins.
5. Loop field installation. Excavation for horizontal or drilling for vertical, pipe install, pressure testing, backfill, site restoration. My crew, my equipment, no subcontractors.
6. Heat pump and air handler installation. Equipment installed inside the home, connected to the loop field and ductwork.
7. System commissioning. Flow rates, refrigerant charge, controls, performance verification. I don’t leave until the numbers are right.
8. Rebate documentation. I fill out the AHRI certificate, contractor license, IGSHPA credentials, and the completed utility rebate application for you. No charge.

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Equipment I Install

I’m a ClimateMaster GeoElite Dealer. I also install WaterFurnace and other major geothermal brands when the job calls for it. Equipment selection depends on system design, load requirements, and budget.

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What Does Geothermal Installation Cost in Oklahoma?

Geothermal costs more upfront than conventional equipment, but operating costs run 40 to 60 percent lower and the loop lasts 50-plus years. Oklahoma utility rebates take a serious bite out of net cost. These are typical installed ranges for central Oklahoma. Exact quote after Manual J and site visit.

Installed estimates for central Oklahoma. Exact quote after Manual J load calculation and site evaluation. Loop field cost is the largest variable. I handle the rebate paperwork (AHRI cert, contractor license, IGSHPA credentials) at no additional charge.

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Oklahoma Utility Rebates I Stack on Geothermal (2026)

Oklahoma utility rebates are fully active for 2026 installs, and I file the paperwork for you. Here is the full matrix I work from:

See the full Oklahoma geothermal rebates guide ›

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Before we talk system selection, it helps to know what to expect from geothermal ownership. Here is what Oklahoma homeowners actually experience with geothermal, the real numbers, not the brochure version.

If you are in CKenergy’s 10-county service area, the math gets even better. The CKenergy geothermal rebate up to $24,000 stacks on top of OG&E and Cimarron Electric incentives where eligible. Note: Kingfisher County is not in CKenergy territory, but Blaine, Canadian, Custer, and seven other counties are.

Own a geo system already and something is not right? My geothermal heat pump repair in Oklahoma page covers what I see most often and typical diagnostic costs.

Frequently Asked Questions

Who is the best geothermal installer in Oklahoma?

I’m biased, but here is what I bring: IGSHPA Accredited Installer (the gold standard for loop design), ClimateMaster GeoElite Dealer (top dealer tier), Marquis Who’s Who in America 2026, 45 years HVAC experience, 30-plus years on geothermal specifically, 200 to 300 ton commercial grow-house loop fields under my belt, BBB A+ for 11 years, 4.8 stars across 276 reviews. I own the drill rig and the trencher, so no subcontractors on your loop. Call 405-375-4822 for a free estimate.

What does geothermal cost in Oklahoma in 2026?

A residential geothermal install in central Oklahoma runs $24,000 to $45,000 before utility rebates. A typical 3 to 4 ton job lands $24,000 to $38,000 fully installed, loop included. The ground loop is 40 to 55 percent of the total. CKenergy ($2,000/ton, max $24k) and OG&E ($1,000/ton) take a serious bite out of net cost. Call 405-375-4822 for an exact quote after a Manual J load calc.

Is geothermal worth it in Oklahoma?

Yes, if you plan to stay in the home 8-plus years. Operating costs run 40 to 60 percent lower than conventional HVAC, the ground loop carries a 50-year warranty, and the indoor heat pump lasts 20 to 25 years. In Oklahoma our temperature swings from 8 degrees in January to 108 in August make geothermal especially valuable because the ground stays a steady 55 to 60 degrees year-round, so the system never fights extreme outdoor temps the way conventional HVAC does.

How long does a geothermal installation take?

Most residential installs take 5 to 10 working days from loop drilling to system commissioning, depending on loop type and weather. Horizontal trenched loops are usually faster (3 to 5 days for the loop, plus equipment install). Vertical bored loops take longer due to drilling time. I coordinate with the builder on new construction so loop installation happens before the slab gets poured, which saves you money and disruption.

Which Oklahoma utility pays the biggest geothermal rebate?

CKenergy pays $2,000 per ton, capped at $24,000, in 10 western counties. Important: Kingfisher County is NOT in CKenergy territory. OG&E pays $1,000 per ton on geo plus $1,500 per unit on conventional HVAC, capped at $3,000. OEC pays $400 to $700 per ton. Cimarron Electric pays $600 in the Kingfisher area. KPWA and CVEC confirm rebates case by case.

How long does a geothermal system last in Oklahoma?

A properly installed ground loop has a 50-plus year service life per IGSHPA. The indoor heat pump unit typically lasts 20 to 25 years. The loop usually outlives the heat pump 2 to 3 times over, which is why the long-run math works even at the higher sticker price.

When is a $3,500 geothermal rebuild better than a $30,000 replacement?

If your loop tests good and the indoor heat pump is the failure point, a refurbishment starts at $3,500 and carries up to a 5-year warranty when the loop verifies clean. That extends system life 8 to 10 years versus a $15,000 to $30,000 full replacement. Call 405-375-4822 and I will pressure-test the loop before quoting anything.

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