Every few months a customer asks us about geothermal.
They've read an article. They've seen a number. They've been told that geothermal is the quietest, most efficient, most sustainable heating and cooling system possible. And technically, all of that is true.
Then they ask us to quote one.
And then we have to have an honest conversation.
We install geothermal systems. We have the equipment, the certifications, and the partnerships with the drilling companies. We've put them into Utah homes. So we're not about to tell you geothermal is a scam — it's legitimately the best HVAC technology on the market from a pure efficiency standpoint.
But for most people reading this: it's probably not the right choice for your house. Here's why.
How geothermal actually works
A geothermal heat pump uses the ground as its "outdoor air." Instead of pulling heat from cold winter air or dumping heat into hot summer air (like a regular air-source heat pump), it pulls heat from the earth about 6-10 feet below the surface, where the temperature stays roughly 50-55°F year-round in Utah regardless of what's happening at the surface.
That 50-55°F baseline makes the system far more efficient than an air-source system. In the dead of winter, when an air-source heat pump is trying to extract heat from 15°F air, the geothermal system is casually pulling from 52°F ground. In the worst summer heat, when an air-source system is dumping into 100°F air, geothermal is dumping into the same 52°F ground.
The result: COPs (coefficient of performance) of 4.0-5.5, compared to 2.5-4.0 for air-source. That means 40-50% more efficient than an already-efficient air-source heat pump, and maybe 60-70% more efficient than a gas furnace.
The equipment is also quieter (no outdoor condenser running), longer-lived (25-50 years for the ground loop, 20-25 years for the indoor unit), and has lower operating costs.
On paper, it's a no-brainer.
The install cost is the problem
In Utah, a typical 3-4 ton geothermal system installed in a new home runs $28,000-50,000, depending on the ground loop type (vertical drill wells vs horizontal trenches), soil conditions, system size, and local drilling rates.
Compare that to:
- Gas furnace + AC replacement: $9,000-16,000
- Air-source heat pump: $8,000-14,000
- Dual-fuel (heat pump + furnace): $11,000-18,000
Even with federal tax credits and rebates that can knock $5,000-12,000 off the top, geothermal is typically 2-3x the cost of any other option.
The savings on operating costs are real — somewhere in the range of $500-1,200 per year in a typical Utah home compared to a gas furnace. But with a $15,000-25,000 price premium, the payback period is 15-30 years.
That's longer than a lot of homeowners plan to stay in a house. That's longer than the indoor equipment will last before it needs replacement. And that math assumes utility rates stay flat, which they don't.
When geothermal DOES make sense in Utah
We're not saying don't do it. We're saying be honest about your situation. Geothermal legitimately wins in five scenarios:
1. New construction with a cooperative builder
If you're building a new home in Utah and the builder is willing to include geothermal in the construction budget, the math is completely different. You're financing the extra cost over a 30-year mortgage at mortgage-rate interest. The monthly payment increase is often $50-120/month. The operating cost savings are $50-100/month. It washes out or comes out positive from day one.
This is the #1 "yes" case for geothermal. If you're building and you're shopping for builders, ask which ones have done geothermal before.
2. Very large homes with high heating loads
Houses over 5,000 square feet in Utah have big heating loads — a 5-ton system running 8 months of the year. The operating cost savings scale linearly with size. The install cost doesn't scale as fast because the per-ton drilling cost drops at higher volumes.
A 6-ton geothermal system might save $2,500/year vs a gas furnace in a big Utah home, bringing payback down to 8-12 years, which starts to make more sense.
3. Properties with existing wells or extensive land
If you already have a drilled water well on your property, we can sometimes use an "open-loop" system that draws from the well and returns water to a second well or a discharge point. This dramatically reduces install cost because we skip most of the drilling.
Similarly, if you own 5+ acres and we can lay horizontal trenches (only 6-10 feet deep) across a pasture or unused field, trench installs are about half the cost of vertical drilling.
4. Off-grid or rural locations with expensive gas or propane
A lot of Utah rural homes run on propane, which is expensive. Geothermal paired with solar panels can get a rural home entirely off fossil fuels and pay itself back faster because it's replacing an expensive energy source, not cheap natural gas.
5. Long-term stay + sustainability priorities
If you're planning to be in the house 20+ years and you care about carbon footprint independent of the financial math, geothermal is legitimately the lowest-carbon HVAC option available. Some customers choose it for that reason alone, and that's a completely valid call.
When geothermal DOESN'T make sense (probably you)
You live in a typical Utah suburban home
A 2,000-3,500 square foot Lehi track home on a standard suburban lot has:
- Not enough land for a horizontal trench system
- Vertical drilling costs that run $6,000-12,000 per ton
- A moderate heating load (3-4 tons, typical)
- Existing natural gas service (which keeps the gas-furnace alternative cheap)
For this house — which is the vast majority of Utah homeowners — geothermal doesn't pencil out. A cold-climate air-source heat pump will cost 1/3 as much, achieve 80% of the efficiency, and pay back in 5-10 years instead of 15-30.
You're replacing a working system
Never replace a working HVAC system just to get geothermal. The emissions math doesn't even work out — the carbon cost of manufacturing and installing the new equipment exceeds the operating savings for years. If your current system is working, run it into the ground (literally, efficiency-wise).
You're moving in the next 10 years
Geothermal adds value to a home, but not the full install cost. Appraisers and buyers typically credit geothermal at 50-70% of what you paid to install it. If you're moving in 10 years, you'll never recover the full investment.
Your heating load is tiny
If you live in a well-insulated 1,500 square foot home with a 2-ton load, the operating cost savings on a 2-ton system aren't enough to justify the install premium. The fixed costs of drilling don't scale down proportionally — it's almost the same price to drill for a 2-ton system as a 3-ton system.
What the install actually looks like
If you decide geothermal is right for you (and we've walked you through the math honestly), here's what to expect:
Week 1: Assessment
- We visit the site, evaluate soil type (important for drilling cost), check available land, measure the house, and run a Manual J load calculation to size the system.
Week 2-3: Design and permitting
- System design, equipment selection, drilling bid from a drilling partner, permits pulled from the city.
Week 4-6: Drilling
- Two to six 150-400 foot vertical wells drilled into the yard, depending on system size. This is the noisy, dirty, disruptive part. Figure 3-5 days of drilling with a visible impact on the yard. Drillers backfill and clean up after.
Week 7: Loop installation
- Polyethylene loops pulled into the wells, grouted in place, tied together into a manifold.
Week 8: Indoor unit install
- Geothermal heat pump installed where your furnace used to sit. Ductwork connected. Loop connected to the indoor unit. System filled with antifreeze (propylene glycol).
Week 9: Startup and commissioning
- Pressure tests, loop flow testing, heat rise/drop measurements, thermostat programming. A full day of commissioning to ensure everything is correct before we leave.
Total project timeline: 6-10 weeks from contract signing to fully operational. Total project cost: $28,000-50,000 after rebates.
Rebates and incentives
As of now in Utah:
- Federal IRA tax credit: 30% of the total install cost, no cap for geothermal (this is a big deal — on a $40,000 install, you get a $12,000 federal tax credit)
- Rocky Mountain Power rebates: Modest, typically $200-500 depending on capacity
- Dominion Energy rebates: Not applicable for geothermal (gas utility)
- Utah state incentives: Occasional, check at the time of your install
The federal tax credit is the largest single factor in making geothermal math work. Without it, most projects don't pencil out. WITH it, new construction and large homes start to make sense.
Our honest recommendation
Nine times out of ten, when a Utah homeowner asks us about geothermal, we recommend something else:
- New construction? Yes, geothermal is worth looking at.
- 5,000+ sq ft home with high heating costs? Worth a quote.
- Existing water well on the property? Worth a quote.
- Everyone else? Start with a cold-climate air-source heat pump or dual-fuel system. Same concept, 1/3 the cost, 80% of the benefit.
The tenth time — when the numbers actually work — we're happy to install it, and it'll be the most efficient HVAC system you can put in a Utah home. But we're not going to tell you geothermal is the answer when it isn't. That's not the business we're in.
If you want us to run the real numbers for your specific house — your square footage, your heating load, your land, your timeframe — we do free consultations. We'll run both the geothermal scenario and the cold-climate heat pump scenario and put them side by side so you can see which one actually makes sense.
Sometimes it's geothermal. Usually it isn't. Either way, you'll walk away with honest math.