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HVAC Services · Geothermal

Geothermal Heating & Cooling for Southern Utah

Geothermal is the most efficient HVAC technology on the market, and one of the few investments that genuinely pays for itself. We design, install, and service ground-source heat pump systems across Southern Utah.

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Same-day service available across the St. George metro area. Free estimates on installs.

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Ground-source heat pumps

The most efficient HVAC technology on the market, and one of the few that genuinely pays for itself.

Geothermal isn't right for every home, but when it fits, nothing else comes close. Ground temperatures four feet down stay around 55–65°F year-round in Southern Utah, which is a massive efficiency advantage in our climate. M&M Mechanical Inc. has been installing geothermal systems since long before they were mainstream.

Here's why it works in Southern Utah specifically: ground temperatures four feet down stay around 55–65°F year-round, regardless of whether the air is 115° or 28°. A geothermal system rejects heat into that 60° earth in summer and pulls heat out of it in winter. That's a vastly easier job than fighting 115° air or freezing wind. Coefficients of performance regularly hit 4.0–5.5, meaning every kWh of electricity moves four-plus kWh worth of heat.

The catch: upfront cost is higher because of the loop field excavation. The 30% federal tax credit (with no cap) closes a meaningful chunk of that gap, and operating savings typically pay back the difference in 7–12 years. After that, you're banking the savings while neighbors with conventional systems are still paying full price. Read more in our deep dive on how geothermal actually works.

Geothermal feasibility assessment Compare to air-source heat pumps

How geothermal works

Use the earth as your battery.

Underground temperatures stay nearly constant year-round. Geothermal heat pumps move heat to or from that stable reservoir instead of fighting the air.

Closed-loop fields

HDPE piping buried vertically (200–400 ft bores) or horizontally (4–6 ft trenches). Water-antifreeze mix circulates through the loop, exchanging heat with the soil.

Indoor heat pump

Ground-source unit installed in a mechanical room or closet. No outdoor condenser to vandalize, freeze, or weather. Quieter than any air-source system.

Distribution

Standard ductwork or hydronic radiant. Most retrofits keep existing ducts, sometimes with minor modifications. New construction can integrate radiant floor heating beautifully.

Why M&M Mechanical Inc.

Geothermal experience matters.

Most contractors will quote you a geothermal system. Far fewer have actually installed enough of them to know where the corners are.

Family-owned since 1992

Installing geothermal in this region long before the federal tax credits made it fashionable.

Licensed & insured

Utah-licensed HVAC and refrigeration. Coordinating with bonded drillers and excavators.

All makes & models

WaterFurnace, ClimateMaster, Bosch, Carrier: we install and service them all.

Service after the install

Loop pressure testing, flow center service, and full performance tuning when needed.

Service area

Geothermal systems across Southern Utah

Geothermal is a particularly strong fit for custom homes in Ivins and Toquerville where lots are large and gas service is spotty. But we install across the metro.

Washington

0 minutes. Our shop is in Washington

St. George

8–15 minutes from our Washington shop

Hurricane

20–25 minutes from our Washington shop

Ivins

20 minutes from our Washington shop

Santa Clara

15 minutes from our Washington shop

La Verkin

25 minutes from our Washington shop

Toquerville

25 minutes from our Washington shop

Springdale

45 minutes from our Washington shop

What working with us looks like

A multi-trade install, project-managed end to end.

Geothermal involves drillers, excavators, electricians, and HVAC. We coordinate everything.

  1. 01

    Feasibility & quote

    Site walk, lot assessment, load calc, loop sizing, written numbers including tax credits.

  2. 02

    Loop field installation

    Drilling or trenching with our coordinated subs. Flush, pressure-test, and grout.

  3. 03

    Mechanical install

    Indoor heat pump, ductwork mods, controls, and integration with existing systems.

  4. 04

    Commission & document

    Performance test, IRS tax-credit paperwork, owner walkthrough, maintenance plan.

Geothermal FAQ

Can I install geothermal in an existing home?
Yes, though retrofits cost more than new construction because of the loop field excavation. Vertical bore loops fit on smaller lots (we drill 200–400 feet down per loop), while horizontal loops need a few thousand square feet of yard space. The mechanical side is straightforward; the loop field is what drives schedule and cost. We coordinate with local well drillers and excavators we've worked with for decades.
How much does a residential geothermal system cost?
For a typical Southern Utah home, a complete geothermal install runs roughly $25,000 to $45,000 before the 30% federal tax credit, depending on size, loop type, and site conditions. After the federal credit, real out-of-pocket is often $18,000 to $32,000. Operating cost is the lowest of any HVAC technology, typically 25–50% lower than even a high-efficiency heat pump.
Does the 30% federal tax credit still apply to geothermal?
Yes. The Inflation Reduction Act extended the residential geothermal tax credit at 30% through 2032 (stepping down to 26% in 2033 and 22% in 2034). Unlike air-source heat pump credits, the geothermal credit has no dollar cap. You get 30% of the entire qualified system cost, including loop field installation. We provide the IRS-required documentation when the install is complete.
How long does a geothermal loop field last?
The buried loop itself typically lasts 50+ years. The HDPE pipe used for ground loops is rated for over a century in soil. The indoor heat pump unit lasts about 20–25 years (longer than air-source equipment because it's not exposed to weather). When the heat pump eventually needs replacement, the loop field stays in place and the next install is dramatically cheaper.
Will geothermal work on my lot in Southern Utah?
Almost always, yes. Vertical bore loops work on essentially any lot, even very small ones, because the bores go straight down. Horizontal loops need more space but are cheaper to install when there's room. Our soils are well-suited: stable temperatures, decent thermal conductivity, and the local well-drilling industry has serious capacity. Lot-specific feasibility is part of our free assessment.
How long does a geothermal install take?
Plan on 2–4 weeks from start to commissioning, with the loop field driving the schedule. Drilling typically takes 3–7 days depending on the number of bores. Once the loops are in and pressure-tested, the indoor mechanical work is similar to a standard heat pump install, usually 2–3 days. We coordinate the entire timeline so trades aren't tripping over each other.

Wondering if geothermal makes sense for your project?

We'll do an honest feasibility check, including the bad news if your lot or budget isn't a fit.

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