Cool Talk with Hartzell's | Your HVAC Questions, Answered!

The Dirt Under Your House Is A Battery

Dave Hartzell

Use Left/Right to seek, Home/End to jump to start or end. Hold shift to jump forward or backward.

0:00 | 22:47

Give Use A Shout

Thanks for tuning in to Hartzell’s Heat & Air — your trusted HVAC experts in Oklahoma and beyond. From Kingfisher to coast-to-coast consulting, we design, install, and maintain smart, efficient systems that deliver year-round comfort.

We’re employee-owned, family-run, and powered by 48+ years of experience. Whether it’s AI-powered thermostats, geothermal systems, or classic tune-ups, we deliver upfront pricing, expert care, and warranties that back it all up.

🛠️ Book Online:
https://book.housecallpro.com/book/Hartzells-Heat--Air/4a569038b3dc460daf2d5f6497b18351?v2=true
🌐 www.hartzellsheatair.com
📞 (405) 375-4822

🚛 Trane Comfort Specialist • Mitsubishi Diamond Dealer • ClimateMaster Elite
 🛡️ VIP Comfort Club • Remote Monitoring • Extended Warranties

📲 Follow us for tips, updates, and real-world installs:
 YouTube: @hartzellsheatair6003
X: https://x.com/HartzellsHVAC
Facebook: facebook.com/hartzellsheatair
LinkedIn: Dave Hartzell

Built on trust. Backed by warranty. Designed for comfort.

Backyard Dirt As A Heat Battery

SPEAKER_01

What if I told you that uh the ordinary dirt in your own backyard is actually this massive, completely untapped thermal battery?

SPEAKER_00

Right. It really is.

SPEAKER_01

Like a battery that if you harness it correctly, could slash your home heating, cooling, and hot water bills by, you know, as much as 70%.

SPEAKER_00

Aaron Powell Yeah. I mean, it sounds totally like science fiction, but it's really just applied physics.

SPEAKER_01

Exactly.

SPEAKER_00

By using a geothermal heat pump, we're basically moving away from that uh brute force method of just burning fossil fuels to create heat.

SPEAKER_01

Right, lighting stuff on fire.

SPEAKER_00

Aaron Ross Powell Exactly, lighting stuff on fire. And instead, we're simply moving existing heat from the earth straight into your living room.

SPEAKER_01

Well, welcome to the deep dive. If you're listening right now, you are someone who loves to learn how the hidden mechanics of the world actually work, you know, without getting bogged down and all the heavy jargon.

SPEAKER_00

Absolutely.

SPEAKER_01

And today we are looking at the realities of keeping that 70% savings promise alive. Because there's a catch.

SPEAKER_00

There's always a catch, right?

SPEAKER_01

Right. If you call an HVAC company to check on, like a standard gas furnace, it might cost you around 99 bucks. But if you look at the maintenance plans for a geothermal system, you might see numbers approaching$500 a year.

SPEAKER_00

Yeah, it's a completely different ballgame.

SPEAKER_01

So why is it so expensive? Like what is happening in your backyard and your basement that requires this incredibly elite specialized level of care?

SPEAKER_00

Aaron Powell Well, to answer that, we're actually looking at a highly specific industry standard service document today. It's saved for an operation called Heart Cells Heat and Air.

SPEAKER_01

Which is a company based out of central Oklahoma, right?

SPEAKER_00

Yep, central Oklahoma. And this document, it outlines the exact uh 10-step protocol that a trained technician has to follow.

SPEAKER_01

Aaron Powell Just to ensure the system doesn't just run, but actually runs efficiently enough to maintain those massive savings.

SPEAKER_00

Exactly. Because if it's not efficient, you lose the whole point of geothermal.

Why Geothermal Maintenance Costs More

SPEAKER_01

And the mission of this deep dive isn't just to read a checklist to you. We're going to decode the fascinating science, the physics, and honestly, the hidden math that these trained technicians use to literally pull heat out of the dirt.

SPEAKER_00

Aaron Powell It really is fascinating when you get down to the nuts and bolts of it.

SPEAKER_01

So let's start with uh what happens the moment a tech walks down into your basement. The very first thing they do, according to the document, is turn the heat pump on, force it to run at its highest factory blower speed, and its weight. Yeah. They wait for like five to ten minutes. I have to be honest, if I turn on my gas furnace, I mean I feel heat at the vent in about 30 seconds.

SPEAKER_00

Oh, sure. Yeah.

SPEAKER_01

Why is the technician just standing around for 10 minutes billing you by the hour?

SPEAKER_00

Aaron Powell Well, it's because thermodynamics uh it needs a moment to stabilize. I mean a geothermal system isn't just a burner igniting like your gas furnace. Right. It's this incredibly complex cycle of fluids. Yeah. You really have to ensure that the evaporator coil, the refrigerant, and the coaxial heat exchanger all reach their, you know, their proper operating temperatures.

SPEAKER_01

Aaron Powell Okay, let's define coaxial heat exchanger really quickly for anyone who isn't uh an engineer.

SPEAKER_00

Aaron Powell Oh, sure. So think of it as a tube within a tube.

SPEAKER_01

Okay.

SPEAKER_00

The water that just came in from the earth loop out in the yard that flows through the inside tube, and the refrigerant flows around it in the outer tube.

SPEAKER_01

Aaron Powell So they don't actually mix.

SPEAKER_00

Aaron Ross Powell Exactly. The heat just transfers across the metal wall between them without the two liquids ever physically touching each other.

SPEAKER_01

Aaron Powell Got it. So we're waiting for that metal and all those fluids to reach a steady, stable temperature.

SPEAKER_00

Aaron Powell Correct. And furthermore, you need enough time to pass to achieve good refrigerant oil circulation throughout the entire system.

SPEAKER_01

Oh, so the compressor needs its lubrication.

SPEAKER_00

Right. If a tech takes a diagnostic reading in, say, minute two, they're measuring a system that is essentially still waking up. The data will be completely inaccurate.

SPEAKER_01

Aaron Powell But during this five to ten minute warm-up, the tech actually has to do something very specific to the house itself.

SPEAKER_00

Yes, they do.

SPEAKER_01

If you have different climate zones in your home, like an upstairs thermostat and a downstairs one, all those zone dampers must be forced wide open. Yep. And the desuperheater, which is the system's hot water assist, that has to be turned completely off.

SPEAKER_00

Right, because opening the dampers ensures maximum airflow through the ductwork. You're removing air resistance variables. You want that air moving as freely as possible.

SPEAKER_01

Aaron Powell And turning off the desuperheater.

SPEAKER_00

That's all about isolating the primary circuit.

SPEAKER_01

It's basically like trying to calculate your car's exact gas mileage, right?

SPEAKER_00

That's a great way to put it.

SPEAKER_01

Like if you want to know exactly how efficiently the engine is moving the wheels, you have to turn off the air conditioning, you unplug your phone charger, you turn off the radio.

SPEAKER_00

You isolate the engine.

SPEAKER_01

Yeah, you isolate the engine. So here the technician shuts off the extra stuff so they can accurately measure the BTUs going strictly in and out of the ground loop. You don't want the hot water heater stealing some of that heat and you know completely messing up your math.

SPEAKER_00

Exactly. And once that primary circuit is isolated and stabilized, the technician moves to the water side of the math.

SPEAKER_01

Right. Steps two and three.

Stabilizing The System For Accurate Readings

SPEAKER_00

Yeah. This is where they measure exactly what the Earth is delivering. They take these gauges and probes and insert them into what the document calls PT ports.

SPEAKER_01

Which stands for pressure and temperature ports.

SPEAKER_00

Right. So they check the water pressure going into the unit and the water pressure leaving the unit.

SPEAKER_01

And you subtract the high from the low, and boom, you get your delta P, your pressure differential.

SPEAKER_00

Exactly. And then they do the exact same thing for the temperature. Water temp entering, water temp leaving, subtract the high from the low, and you get your delta T.

SPEAKER_01

The temperature differential.

SPEAKER_00

Yes. And those raw physical readings, they are then converted into basically a story about heat transfer.

SPEAKER_01

How so?

SPEAKER_00

Well, the manufacturer provides this specification book. It takes that delta P, that pressure differential, and converts it to the exact water flow rate in gallons per minute or GPM.

SPEAKER_01

Oh, I see.

SPEAKER_00

So now you know exactly how much water is moving and how much the temperature of that water is changing as it moves.

SPEAKER_01

Which brings us to this really fascinating formula in the document. Step four.

SPEAKER_00

The heat of extraction.

SPEAKER_01

Right. To calculate the heat of extraction, which is literally just how much heat you are successfully stealing from the dirt, you multiply that temperature change by the water speed.

SPEAKER_00

The delta T times the GPM.

SPEAKER_01

Right. But then you multiply all that by something called a fluid factor.

SPEAKER_00

Yes, the fluid factor is critical here.

SPEAKER_01

And the document gives two very specific numbers for this. If you have an open loop system running just pure water, the fluid factor is exactly 500.

SPEAKER_00

Correct.

SPEAKER_01

But if you have a closed loop system running a mix of water and antifreeze, the fluid factor actually drops to 485. Why do those liquids get like different mathematical multipliers?

SPEAKER_00

Well, it all comes down to thermal mass and specific heat capacity.

SPEAKER_01

Untack that a bit.

SPEAKER_00

Sure. Pure water transfers heat incredibly efficiently. It has a very high specific heat, meaning it can absorb a whole lot of thermal energy before its own temperature actually rises.

SPEAKER_01

Wow, okay.

SPEAKER_00

And that efficiency is what earns it the higher multiplier of 500. But you know, if you live in a climate where a closed loop might freeze in the winter, you have to add anti-freeze.

SPEAKER_01

Right, usually a glycol mix or something.

SPEAKER_00

Exactly, a glycol mix. And that mixture is slightly thicker and it's slightly less thermally conductive than pure water.

SPEAKER_01

Oh, so it just doesn't carry the heat as well.

SPEAKER_00

Right. Because it isn't quite as good at carrying heat. It requires that lower multiplier of 485 just to make the final calculation accurate.

SPEAKER_01

That makes total sense. So when the tech runs that whole formula, delta T times GPM times the fluid factor, they end up with a number of BTUs, British thermal units.

SPEAKER_00

Yep. The standard measurement of heat energy.

SPEAKER_01

And the document is super rigid about this. The result must fall within 10% of the manufacturer's specification for your specific machine.

SPEAKER_00

Oh, absolutely. Because falling more than 10% under spec, I mean, that is not just a minor inefficiency. It is a massive red flag.

SPEAKER_01

What does it actually mean, practically speaking?

SPEAKER_00

It indicates a systemic failure. It tells the technician that you likely have a critical water flow issue, maybe a kinked pipe buried way out in the yard, or slow refrigerant leak, or even severe air distribution problems.

SPEAKER_01

Aaron Powell Wow. So if you are the homeowner paying for this service, this is the exact moment the technician is proving whether or not you were actually getting that 70% savings you were promised.

SPEAKER_00

Exactly. It's the moment of truth.

SPEAKER_01

But I mean, the water math only really diagnoses the health of the subterranean part of the system, right? Like we've proven the dirt is doing its job and delivering heat to the basement. Right. But that doesn't matter at all if it's not reaching your living room. So how do we track the heat through the vents?

SPEAKER_00

Well, that's step five. We shift to the air side formula, which calculates sensible heat.

SPEAKER_01

Sensible heat meaning the heat you can actually feel.

SPEAKER_00

Exactly. It's the actual temperature change you feel in the air. So the formula here is the delta T of the air. That's the temperature difference between the air entering the return vent and the air blowing out of the supply vent.

SPEAKER_01

Okay, air temp difference. Got it.

SPEAKER_00

Right. And you multiply that by CFM, which is cubic feet per minute of airflow, and then you multiply that by a constant of 1.08.

SPEAKER_01

Okay, so that gives you the actual heat blowing through your ductwork. But there's a really specific detail here that caught my eye. Oh yeah. Yeah. The source notes that this sensible BTU number includes not just the heat extracted from the ground, but also the BTUs coming off the compressor, the pumps, and the blower motor itself.

SPEAKER_00

Yeah, that's a really important point. The machine generates heat simply by operating.

SPEAKER_01

Just from running.

SPEAKER_00

Exactly. Friction, electrical resistance, the mechanical movement in the compressor, all of that creates its own thermal energy.

SPEAKER_01

Oh, I guess that makes sense. So in the winter, when you're in heating mode, that's actually like a bonus. The heat from the motor just gets added to the heat from the earth to warm your house.

SPEAKER_00

It does. But think about the summer.

SPEAKER_01

Right. In the summer, when you want air conditioning, that mechanical heat is totally fighting against you.

Water Side Math For BTUs

SPEAKER_00

Exactly. The system has to work slightly harder to overcome its own internal heat before it can even start to cool the air for your house.

SPEAKER_01

Which is exactly why this precision maintenance is so crucial.

SPEAKER_00

Yeah.

SPEAKER_01

You are constantly managing these tiny thermal penalties.

SPEAKER_00

That's right. Every inefficiency compound.

SPEAKER_01

So let's talk about the electrical side. Because in step six, the tech also has to check the electrical draw, the volts and amps against the manufacturer's range.

SPEAKER_00

Yep. The electrical heartbeat of the system.

SPEAKER_01

But I want to push back on a very specific, quirky detail from the text.

SPEAKER_00

Okay, go for it.

SPEAKER_01

It explicitly warns the technician, and I'm quoting here amps will increase when loop temperature increases.

SPEAKER_00

Right.

SPEAKER_01

Now amps are the measure of electrical current, basically the effort the machine is exerting, right?

SPEAKER_00

Exactly. It's the workload.

SPEAKER_01

So does this mean the hotter the earth loop gets out in the yard, the harder the system's electrical heart actually has to pump?

SPEAKER_00

Yes. Think of the thermodynamics here, like uh riding a bicycle up a hill.

SPEAKER_01

Okay.

SPEAKER_00

In the summer, your goal is to pull heat out of your house and push it into the ground. But as the summer drags on month after month, the ground around your buried pipes gets warmer and warmer from all the heat you keep dumping into it.

SPEAKER_01

Because you're just storing it in the dirt.

SPEAKER_00

Right. So the thermal hill you're pedaling up gets steeper and steeper.

SPEAKER_01

Ah, so the compressor has to physically work harder, drawing more electrical amperage to force that heat out of your house and into a ground loop that is already totally saturated with heat.

SPEAKER_00

Exactly. The temperature gradient is working against you. And conversely, in the dead of winter, if the ground loop gets too cold from you constantly extracting heat from it, it becomes harder to pull what little heat is left.

SPEAKER_01

And again, the electrical lamps go up.

SPEAKER_00

Exactly. It is this beautiful, if slightly unforgiving, physical balancing act.

SPEAKER_01

Wow. Which brings us to the physical components themselves, because you know, math and electrical readings can diagnose a problem, but the physical hardware is where the system literally lives or dies.

SPEAKER_00

Oh, absolutely.

SPEAKER_01

And this is where the wrong chemical cleaner can like destroy your entire investment. Let's look at steps seven and eight.

SPEAKER_00

Right. Moving from theoretical physics to the gritty physical reality of HVAC maintenance. First, the technician inspects the air filter and the evaporator coil.

SPEAKER_01

The tech states the filter should be replaced by the tech every time the unit is serviced, but it really stresses that homeowners need to do this throughout the year too.

SPEAKER_00

Well, yeah, because restricted airflow ruins all those delicate math equations we just spent time calculating.

SPEAKER_01

Totally. But the major warning in the document is actually about cleaning the indoor coil. It is incredibly clear about this. You must use non-acidic cleaners and thoroughly rinse the coil because acid will eat right through them.

SPEAKER_00

Yes. Those heat exchange coils, they are designed with incredibly thin, highly conductive metals, usually aluminum or copper.

SPEAKER_01

Right, because they need to transfer heat fast.

SPEAKER_00

Exactly. Their job is to transfer heat as rapidly as possible, not to withstand harsh, corrosive environments. So if a well-meeting homeowner decides to clean the coil with an aggressive acid-based cleaner just to remove some dust, they are totally compromising the structural integrity of the metal. Yeah. They might get a shiny coil for a few weeks right before it develops these microscopic pinhole leaks and just vents hundreds of dollars worth of refrigerant straight into the atmosphere.

SPEAKER_01

Yikes. And that chemical sensitivity applies to the drain pan as well, doesn't it?

SPEAKER_00

It does. The drain pan catches all the condensation that drips off the cold coil in the summer.

SPEAKER_01

Right. And the tech has to clean out the dirt, the biological growth, and sediment, especially after new home construction where drywall dust just gets everywhere.

SPEAKER_00

Oh, drywall dust is the worst for these systems.

SPEAKER_01

But the source explicitly warns to avoid using chlorine in any drain pan treatment.

SPEAKER_00

Right. No bleach.

SPEAKER_01

Using chlorine in the drain pan is it's like using road salt to melt ice on your driveway. Like, sure, the salt gets rid of the ice really quickly, but it aggressively rusts out the undercarriage of your car in the process.

SPEAKER_00

That's a perfect analogy.

SPEAKER_01

Just because bleach kills bacteria doesn't mean the highly calibrated copper and aluminum machinery is actually going to survive the cleaning.

SPEAKER_00

Exactly. The maintenance requires a real surgical touch. You have to remove the biological buildup without degrading the metals.

SPEAKER_01

So, okay, once the core heating and cooling components are mathematically verified and safely cleaned, the technician moves to the geothermal bonus features.

SPEAKER_00

Step nine.

SPEAKER_01

Right. These are the perks that separate a geothermal setup from, you know, a standard air conditioning unit sitting outside your window.

SPEAKER_00

And the most prominent bonus feature is the desuperheater we mentioned earlier.

SPEAKER_01

The hot water assist.

Airflow Heat Output And Electrical Draw

SPEAKER_00

Right. The tech turns it back on for testing. It scavenges thermal energy that would otherwise just be rejected into the earth.

SPEAKER_01

And dumps it into your hot water tank. The source actually says a properly running desuperheater can save you significant money.

SPEAKER_00

It really can. So the technician lets it run and checks the water temperature. Normal operation is a temperature difference, a delta T, between the water going in and out of just five to fifteen degrees.

SPEAKER_01

I mean, five to fifteen degrees, that doesn't sound like a massive temperature swing at all.

SPEAKER_00

It isn't, but the key is that it is constant. Over hours, days, and months, that five to fifteen degree assist drastically reduces the amount of electricity or gas your hot water heater needs to consume just to get your shower water up to 120 degrees.

SPEAKER_01

Okay, I see.

SPEAKER_00

However, the source notes that if that delta T is extremely high, you have a problem.

SPEAKER_01

Yeah, the text lists a few culprits for a high delta T here. The pump might be turned off, a fuse might be blown, or the heat exchanger is blocked with lime buildup.

SPEAKER_00

Yep, lime scale.

SPEAKER_01

And here is a wild detail that completely contradicts what we just learned about cleaning the air coils.

SPEAKER_00

I know exactly what you're gonna say.

SPEAKER_01

Unlike the main air coils where acid is strictly forbidden, if the D superheater heat exchanger is blocked with lime, the document actually instructs the technician to flush it with a mild acid solution. Like, why the double standard?

SPEAKER_00

It really highlights how localized the maintenance has to be. The desuperheater is interacting directly with your home's domestic tap water.

SPEAKER_01

Right.

SPEAKER_00

And tap water carries dissolved minerals like calcium and lime. Over time, the heat causes those minerals to bake onto the walls of the heat exchanger, creating this insulating layer of scale that literally blocks heat transfer.

SPEAKER_01

Oh wow. So you have to use a mild acid to dissolve that scale.

SPEAKER_00

Yes, but you have to carefully isolate it from the rest of the system so it doesn't touch the delicate aluminum air coils.

SPEAKER_01

It really is a chemical tightrope.

SPEAKER_00

It absolutely is.

SPEAKER_01

And that brings us to the final step of the document, step 10. Which honestly feels like the, I don't know, the crescendo of the whole operation, repressurizing the ground loop.

SPEAKER_00

This is critical. Because the loop is a closed plastic circuit buried underground. Any tiny expansion of those plastic pipes over years, or even microscopic off-gassing of the fluid inside, it gradually lowers the internal pressure. And if the pressure drops too low, the fluid won't circulate effectively, and your heat transfer just plummets.

SPEAKER_01

So they have to add water pressure back into the subterranean loop. And the process they describe is surprisingly analog.

SPEAKER_00

It really is.

SPEAKER_01

They just use your house's standard water pressure. Like the technician hooks up a regular garden hose to an outside spigot or a sink, they run the water at full pressure to get all the air out of the hose. Yeah. Then they attach a specialized repressurization tool to the hose, stick it into the PT plug on the heat pump, and just force house water into the ground loop until it hits the target.

SPEAKER_00

And that target pressure per the water furnace recommendations cited in the text is 40 to 70 psi, or pounds per square inch.

SPEAKER_01

But the most vital part of this entire procedure happens next. Once that pressure is reached, the source says the technician has to, and I love this, burk the loop pumps.

SPEAKER_00

Which is a highly technical industry term, but completely accurate to the physics.

Cleaning Rules That Prevent Damage

SPEAKER_01

They literally loosen a screw on the pump shaft until air and debris physically spit out, wait for a steady stream of water, and then tighten it back up. Yep. It is exactly like burping a baby to get trapped air out of its stomach. Only in this case, a stomach ache is a catastrophic failure of a massive underground thermal battery. So why is trapped air so deadly to this system?

SPEAKER_00

Well, it causes a phenomenon called cavitation.

SPEAKER_01

Cavitation.

SPEAKER_00

Right. Air compresses, water does not. So if the pump's spinning impeller hits a pocket of trapped air, the resistance suddenly vanishes, causing the impeller to overspin.

SPEAKER_01

Oh wow.

SPEAKER_00

Furthermore, the rapid pressure changes caused microscopic bubbles to collapse violently against the middle of the pump. It literally pits and destroys the impeller from the inside out.

SPEAKER_01

That's insane. Yeah.

SPEAKER_00

So burping removes that fatal air pocket before it can cause structural damage.

SPEAKER_01

Which brings us back to the question we asked at the very beginning of the deep dive. Why does a geothermal checkup cost so much more than a standard furnace check? Right. A 10-step checklist like this with fluid factors, chemical tightropes, and system burping, I mean, it's totally useless without an elite professional.

SPEAKER_00

The context matters deeply here. The document we are analyzing isn't just theory, it is the actual operating procedure for Dave Hartzel of Hartzell's Heat and Air.

SPEAKER_01

Right, the real world maestro.

SPEAKER_00

Exactly. His credentials list him as IGS HPA accredited, which is the specific, highly rigorous professional certification required for ground source heat pump systems. And he's a climate master GLE dealer.

SPEAKER_01

Who won Best Newcomer of the Year in 2016 from air product supply. And his service area is all of central Oklahoma and beyond. The text says, have experience, we'll travel.

SPEAKER_00

He knows his stuff.

SPEAKER_01

And looking at his specific preventative maintenance agreement pricing tiers, it really solves the mystery of the cost.

SPEAKER_00

It does. Let's break that down.

SPEAKER_01

Yeah. So Heart Cell offers a Geo Basic Plan for$360 a year, a Geo Plus plan for$428 a year, and the top-tier Geo360 plan for$499 a year.

SPEAKER_00

And if you look closely at what is included in those tiers, there's a really profound economic detail hidden in there.

SPEAKER_01

What's that?

Desuperheater Testing And Scale Removal

SPEAKER_00

That critical repressurization step we just discussed, hooking up the hose, pushing a loop back to 40 to 70 PSI, and burping the pumps to prevent cavitation.

SPEAKER_01

Yeah.

SPEAKER_00

That specific life-saving service is only included in the top-tier$499 GO360 plan.

SPEAKER_01

Oh, wow. It's not in the basic at all.

SPEAKER_00

Not in the basic. It's not even in the plus.

SPEAKER_01

Wow. It really highlights exactly how vital, time-consuming, and specialized that single maintenance step is.

SPEAKER_00

Exactly. It is the premium service that ensures the long-term survival of the buried plastic loop that makes the whole system possible in the first place. That's a great way to think about it. Servicing a geothermal heat pump isn't unrecognizably different from servicing a conventional EC unit. I mean, there are still coils, blowers, and air filters. Yeah. But the precision required is exponentially higher.

SPEAKER_01

Aaron Powell Because skipping the manufacturer's checklist or ignoring the fluid density factors or failing to burp the loop, it leads directly to costly tallbacks.

SPEAKER_00

Yes. And more importantly, it completely destroys that promise of 70% energy savings.

SPEAKER_01

Right. If your loop loses pressure or your coil is just caked in dust, you are paying a massive premium for a system that is honestly performing worse than a cheap window unit.

Loop Pressure Burping And Plan Pricing

SPEAKER_00

It demands a deep appreciation for the thermodynamics happening right beneath your lawn. You are quite literally interfacing with the thermal mass of the planet.

SPEAKER_01

Which requires respect, rigorous math, and very precise execution.

SPEAKER_00

It really does.

SPEAKER_01

It does. And uh that leaves us with a final thought for. To ponder long after you finish listening today. We've spent this time talking about the microscopic precision required to move heat out of the dirt and into your home. But take a step back. If the mundane dirt right beneath your feet, like just the plain patch of grass in your own backyard, holds the exact stable thermal energy needed to drastically reduce your home's reliance on the external power grid. Yeah. How much untapped invisible potential is literally sitting dormant outside your window right now, just waiting for the right loop of pressurized water to unlock it.

SPEAKER_00

Well, it certainly frames the natural world around us in a much more powerful light.

SPEAKER_01

It really does. Well, thank you so much for joining us on this deep dive. Keep questioning the hidden mechanics of your world. Keep looking for the elegant solutions, and we will catch you next time.