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Cool Talk with Hartzell's | Your HVAC Questions, Answered!
Your outdated thermostat habits spike your bill
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The Old Thermostat Rule Breaks
SPEAKER_01The number on your thermostat right now, uh the one you deliberately set this morning because you thought it was, you know, saving you money, is actually secretly spiking your energy bill.
SPEAKER_00Yeah. And the crazy part is it's not because your equipment is broken or anything.
SPEAKER_01Right. It's because the golden rule of home energy savings that well, that we all learned back in the nineties is completely obsolete now.
SPEAKER_00Oh, totally. It's a relic at this point.
SPEAKER_01Welcome to today's deep dive. We are looking at a massive, albeit very quiet, update to the Department of Energy's thermostat guidance. The mission today is pretty simple. We are going to explore why applying a 1995 rule of thumb to a 2026 machine is a strategy that is actively working against you. So, okay, let's unpack this.
SPEAKER_00Well, in a world of just absolute information overload, we humans desperately cling to simple rules of thumb. I mean, they comfort us, you know. We love a good shortcut.
SPEAKER_01Oh, absolutely. Give me a cheat code any day.
SPEAKER_00Exactly. But the problem with short pets is that our behavior often lags way, way behind our technologies. So we upgrade our homes with the state-of-the-art machinery, but then we continue to operate that machinery using logic that honestly belongs in a museum.
SPEAKER_01It's like a complete mismatch.
SPEAKER_00It is. It's a classic mismatch between modern hardware and uh human habits.
SPEAKER_01And that 1995 rule of thumb we're talking about. I mean, it was practically gospel. The Department of Energy repeated it for 20 years. Our parents drilled it into our heads.
SPEAKER_00Turn off the lights, turn down the AC.
SPEAKER_01Right. And it made us feel incredibly responsible. You set your thermostat to 78 degrees in the summer, 68 degrees in the winter. And the absolute golden rule was the setback, right? You bump the temperature up or down by like seven to ten degrees when you leave the house for work.
SPEAKER_00Yep, the classic set it and forget it while you're at the office.
SPEAKER_01Exactly. You let the house get hot in the summer or freezing cold in the winter while it's empty, and boom, you supposedly save about 10% a year on your utility bill.
SPEAKER_00And well, to be completely fair to the DOE here, for most of those 20 years, that advice was bulletproof. It really was the absolute best way to manage your energy consumption.
Why The Light Bulb Logic Fails
SPEAKER_01Aaron Powell But logically speaking, isn't turning off the air conditioning when you leave the house like always cheaper? I mean, it feels exactly like turning off a light bulb in an empty room.
SPEAKER_00Yeah, it does feel that way, yeah.
SPEAKER_01If I leave the room, I flip the switch, the bulb uses zero electricity, and I save money. Why wouldn't a house full of cold air work the exact same way? If the HVAC machine is completely off, it's not pulling any power from the grid.
SPEAKER_00What's fascinating here is that your light bulb analogy is a perfect description of how a traditional older HVAC system works. The DOE's new guidance actually contains a crucial caveat that honestly most people just completely missed.
SPEAKER_01Wait, really? What
Single Stage Versus Variable Speed
SPEAKER_01caveat?
SPEAKER_00Well, if you live in a house with a traditional single stage furnace and a single stage AC, then that old advice absolutely still applies. A single stage system only has two speeds. It's either 100% on or it's 100% off.
SPEAKER_01Oh, okay. So it's very binary.
SPEAKER_00Highly binary. So if you have that older equipment, that seven to ten degree setback is absolutely still going to save you money. The friction and the whole reason for this updated guidance is what happens if you've recently upgraded your equipment.
SPEAKER_01Which I mean, a huge portion of us have. There have been these massive tax credits and rebates over the last few years, really incentivizing everyone to upgrade to those super energy efficient models.
SPEAKER_00Right. And if you have upgraded to a modern variable speed heat pump or a two-stage compressor, applying that old 10-degree setback strategy is just a massive financial mistake.
SPEAKER_01Because it's not a light bulb anymore.
SPEAKER_00Exactly. The off part while you're at work, that's not actually the problem. You are saving pennies while the machine sits idle. The real problem is the massive energetic penalty you incur the exact moment you demand the system turn back on to recover all that lost ground.
SPEAKER_01Okay. We need to clarify the mechanics of this because I think the average person assumes a new variable speed machine is just like a quieter, slightly better version of their old machine.
SPEAKER_00Oh, sure. They see the box outside and think it's the same thing.
SPEAKER_01Yeah. But it's fundamentally different technology, isn't it?
The Recovery Cost That Spikes Bills
SPEAKER_00It's completely different. A variable speed system is engineered from the ground up to run slow and steady. Rather than just a binary on-off switch, imagine a compressor that has, I don't know, dozens of gears. Okay. It is specifically designed to find a low, gentle speed and just cruise there all day, maintaining the temperature with an incredibly low wattage draw. It wants to sip electricity, not chug it.
SPEAKER_01So let's play out the typical scenario here. It's August, you leave for work and you let the house drift eight degrees warmer because you are diligently following that 90s rule of thumb.
SPEAKER_00Right, doing what you were taught.
SPEAKER_01Yeah. Then you go home at 5 p.m., the house is 83 degrees in sweltering, and you walk over to the wall and demand that it cool back down to 75 instantly.
SPEAKER_00And by doing that, you are forcing a precision machine into an absolute panic. The compressor's algorithm looks at that massive eight degree gap and realizes, uh-oh, I cannot gently cruise to reach that target before midnight.
SPEAKER_01Right. It's too big of a hill to climb.
SPEAKER_00Exactly. So to satisfy your immediate demand for comfort, it jumps to full maximum output. And here's the kicker full output is its absolute least efficient mode. The entire reason you paid thousands of dollars extra for a variable speed machine was so it could avoid running at full output.
SPEAKER_01The source material had this brilliant analogy for this. It said doing this to a modern HVAC system is exactly like paying for Ferrari and then driving it like a U-Haul truck.
SPEAKER_00That is so spot on.
SPEAKER_01Right. You bought an instrument designed for smooth, continuous performance, and you're just stomping the gas pedal to the floor and then slamming on the brakes.
Auxiliary Heat Strips Budget Killer
SPEAKER_00Yeah. And believe it or not, the winter scenario is actually even worse. The sources outline this heating phenomenon they call the silent budget killer, and this is where the math truly turns against you.
SPEAKER_01Wait, okay. I always thought a heat pump just magically worked in reverse. Yeah. You know, pulling ambient heat from the outside air and moving it indoors. Where is this extra budget killer coming from? Is there like a secret gas burner hidden in my ductwork that I don't know about?
SPEAKER_00Not gas, but electric. If you have a modern heat pump, you very likely have auxiliary electric heat strips installed right inside the indoor air handler.
SPEAKER_01Okay, what do those do?
SPEAKER_00Well, you're right that heat pumps are incredibly efficient at pulling ambient heat out of the outdoor air, even when it's near freezing. But they work gradually, they extract heat very slowly. So if it's really cold outside, and you suddenly ask the system to heat the house up by 10 degrees because you just walked in the door from work.
SPEAKER_01The slow and steady thing isn't gonna cut it.
SPEAKER_00Nope. The heat pump compressor simply cannot recover that fast on its own.
SPEAKER_01And the thermostat knows this, right? It calculates the temperature difference and realizes the compressor is gonna lose that battle.
SPEAKER_00The thermostat sees that math failing in real time. So to keep you from freezing in your living room while you wait, it panics and calls for backup. It triggers those auxiliary electric heat strips.
SPEAKER_01Oh boy.
SPEAKER_00Yeah. Think of these as giant toaster coils or like a dozen high-powered hairdryers mounted directly inside your ductwork.
SPEAKER_01So what does this all mean for the monthly bill? Because running a dozen hairdryers at once sounds financially terrifying.
SPEAKER_00It should be terrifying. A normal heat pump compressor running in its efficient slow mode might pull about three kilowatts of power. Those emergency heat strips. They pulled 10 to 15 kilowatts. What? Yeah, it is staggeringly expensive.
SPEAKER_01It's literally three to five times more expensive to run.
SPEAKER_00Exactly. So if your house drops to 60 degrees overnight because you think, hey, I'm saving money while I sleep, and then you wake up and demand 70 degrees immediately, you trigger those strips. You just turned your highly efficient, state-of-the-art heat pump into the world's most expensive space heater for 45 minutes. That is
New DOE Setback Limits
SPEAKER_00just wow. Whatever the updated DOE numbers finally reflect this new reality. For summer cooling, they do still recommend 78 degrees when you are home and awake. But here's the massive shift. If you have a heat pump or a variable speed AC, you should have a maximum setback of only four degrees when you are away.
SPEAKER_01A maximal of four degrees. Wow. Not the massive seven to ten degree swings we used to enforce.
SPEAKER_00Not at all. And for winter heating, the DOE recommends 68 degrees when you are home. But if you have a heat pump, do not drop the temperature more than two degrees if it is below freezing outside.
SPEAKER_01Only two degrees. That is an incredibly tight band. People are so used to letting their houses just free fall while they're at work.
SPEAKER_00I know. It requires a completely different philosophy of home management. You are no longer managing on versus off. You are managing the momentum of the machine.
SPEAKER_01The momentum. I like that. There is actually a fantastic real-world example in our sources that brings this whole abstract math thing
Comfort Equals Temperature Plus Humidity
SPEAKER_01to life. It's a guy named Dave Hartzell.
SPEAKER_00Ah, yes, Dave.
SPEAKER_01Yeah, he's an HVAC technician with 45 years of experience running a business down in Kingfisher, Oklahoma. Dave basically laughs at the old set it and forget it with a massive setback rules. He has a variable speed system in his own house. In the summer, he sets it to 75. In the winter, he sets it to 70. And he basically never touches it again. No setbacks, no fiddling.
SPEAKER_00And the result of that is that Dave's system cycles long and low. His energy bill is consistently lower than his neighbors who are, you know, constantly playing with their thermostats, trying to outsmart their own machinery.
SPEAKER_01Okay, I do have to push back on Dave's strategy for a second, just on behalf of anyone listening who lives in a hot, humid climate, 75 degrees in the summer. In an Oklahoma summer, where the sources note the dew point is constantly hovering between 60 and 80 percent.
SPEAKER_00It sounds hot, right?
SPEAKER_01It sounds like an absolutely sweaty, miserable nightmare. If the humidity is high, my house would feel like a swamp at 75 degrees.
SPEAKER_00Well, it would feel like a swamp if you had a traditional single-stage system that was short cycling. But this introduces something we can call the comfort equation.
SPEAKER_01The comfort equation.
SPEAKER_00Yeah. Comfort isn't just a raw number on a thermometer. The actual equation for human comfort is temperature plus humidity plus airflow.
SPEAKER_01Wait, go back a second. Short cycling. Is that when the AC just blasts for 10 minutes, turns off, and then turns right back on again a few minutes later?
SPEAKER_00Exactly that. It's like sprinting a hundred-yard dash over and over rather than just going for a long, continuous jog. Right. Think about what an air conditioner actually does. It doesn't just cool the air, it conditions it. Oh, right. A huge part of that conditioning process is removing moisture. A traditional single stage system blasts at 100% capacity, cools the ambient air in the house very quickly, say in 10 or 15 minutes, and then shuts off.
SPEAKER_01Right. Because the air in the room quickly hit the target temperature on the wall.
SPEAKER_00Exactly. But 15 minutes is nowhere near enough time to pull the humidity out of the air or out of the thermal mass of your home. Your walls, your couch cushions, your hardwood floors, they all hold on to moisture and heat.
SPEAKER_01I never even thought about the furniture holding moisture.
SPEAKER_00It totally does. So the AC shuts off, and you have a house where the air is technically 72 degrees, but it's incredibly humid. The air feels clammy, it feels sticky. The moisture radiates back out of the furniture. You feel like you need a sweater because the air blowing on you is freezing, but you're also somehow sweating.
SPEAKER_01I know exactly that feeling. You're cold, but you're damp. It's the worst possible combination.
SPEAKER_00It is the worst. Now, Dave Hartzell's variable speed system operates on a totally different paradigm because he sets it to 75 and leaves it there. The machine runs at a very low speed for hours at a time. It is constantly circulating the indoor air over the cold evaporator coil. It basically acts as a massive whole house dehumidifier all afternoon long.
SPEAKER_01Oh, I see. So it's wringing the moisture out of the house like a giant sponge, slowly and continuously rather than just blasting the air and turning off.
SPEAKER_00Exactly. And a bone-dry 75 degrees feels incredibly cool and comfortable on human skin. Your sweat can actually evaporate. Whereas a short cycling, clammy 72 degrees feels terrible. So Dave isn't suffering at 75 degrees. He is significantly more comfortable than the person freezing at 72, and he's paying less money for that superior comfort.
SPEAKER_01Here's where it gets really interesting though.
Smart Thermostat Defaults Fight HVAC
SPEAKER_01Because if managing this comfort equation, you know, balancing the humidity, the thermal mass, the compressor speeds, if it's all so complex, this is exactly why we all started buying smart thermostats in the first place.
SPEAKER_00Oh, definitely.
SPEAKER_01We buy a nest or an EcoBee, we slap it on the wall, and we just assume it's going to do all this complex math for us. We assume it is the modern brain that this modern system needs.
SPEAKER_00And that assumption is exactly where millions of homeowners are falling into a very expensive trap. The paradox of the modern smart thermostat is that straight out of the box, their default programming is entirely built for the old world.
SPEAKER_01Wait, the brand new Wi-Fi connected technology is defaulting to 1995 logic.
SPEAKER_00It is. Their default auto schedules, their eco modes, and especially their geofencing features, they are all heavily designed to maximize theoretical savings by enforcing aggressive temperature setbacks. They are actively programmed to fight a variable speed system.
SPEAKER_01The geofencing feature is fascinating to me. The whole pitch is that the thermostat tracks your phone's GPS location. So it knows exactly when you leave the house and it knows when you are commuting back.
SPEAKER_00Right. And our sources highlight a specific geographic scenario that perfectly illustrates how this fails in practice. So imagine someone who lives in Dave's town of Tingfisher, but they commute 40 miles to Oklahoma City for work.
SPEAKER_01Okay. So they leave for work in the morning and the smart thermostat says, aha, the phone has left the geofense. Time to save some money. And it completely abandons the temperature target.
SPEAKER_00Exactly. The algorithm sees an empty house and lets the indoor temperature drift eight, maybe ten degrees warmer in the middle of the summer to save energy. Then at 5 p.m. the person gets in their car and starts their 40-mile drive home. When they hit the edge of the geofense, say 10 miles from the house, the thermostat realizes they are returning. It looks at the current temperature, looks at the target temperature, sees a massive 10 degree gap, and just panics.
SPEAKER_01Because its entire goal is to have the house perfectly chilled the moment the homeowner turns the key in the front door.
SPEAKER_00Precisely. To achieve that, it has to trigger the expensive heat strips in the winter, or it ramps the compressor to absolute maximum 100% speed in the summer. It runs incredibly hard using maximum wattage, trying to close a 10-degree gap before the car pulls into the driveway.
SPEAKER_01So the homeowner walks in, the house feels great, they look at the little green leaf icon on their app and they think, wow, my smart thermostat saved me money all day while I was at the office.
SPEAKER_00But they didn't save anything. They just moved the energy use to a different time of day. And because they forced a variable speed system to operate in its least efficient, highest wattage mode to recover all that thermal mass, they almost certainly used more total kilowatt hours than if they had just left the temperature alone all day.
SPEAKER_01So if my expensive smart thermostat is actively sabotaging my new heat pump right out of the box, do I just rip it off the wall? I mean, am I supposed to buy a $200 device and immediately disable half of its brain?
Use Smart Data Not Eco Modes
SPEAKER_00If you have a variable speed system, honestly, yes, you absolutely should turn off those specific features. You want to enforce a tight band, 75 to 76 in the summer, 68 to 70 in the winter, turn off the aggressive geofencing, turn off the eco modes that enforce massive swings.
SPEAKER_01Then what is the point of having a smart thermostat at all? Why shouldn't I just reinstall my dad's old mercury dial from the garage?
SPEAKER_00Because the real value of smart technology for modern HVAC isn't in aggressive setbacks. It's in the data it provides. You want to use the smart features for what they actually excel at. For instance, runtime data.
SPEAKER_01Why do I care how long my hair conditioner runs? I mean, isn't less running always better?
SPEAKER_00Not anymore. Runtime data tells you the health and the sizing of your system. If your smart app tells you the AC ran for 14 hours yesterday on a 92-degree day, your instinct might be to panic and call a repair man.
SPEAKER_01Yeah, I would assume the motor is overworked or the refrigerant is leaking or something.
SPEAKER_00Right. But on a variable speed unit, 14 hours of runtime is exactly what you want to see. Long, low, steady runs. That means it is constantly dehumidifying the air and sipping electricity. Okay, that makes sense. On the other hand, if your app shows the system only ran for four hours total, but in massive short chunks and your house feels clammy, you have a major problem. Your system is likely drastically oversized for your house's square footage, or you have a dirty coil and it's losing capacity. That is incredible diagnostic information that an old dial thermostat simply cannot give you.
SPEAKER_01That is so true. The sources also mention smart filter reminders, which sounds really basic, but it's actually huge for modern equipment.
SPEAKER_00It is huge. Most homeowners don't realize that modern systems often use thick, high-efficiency media filters that need to be swapped based on actual airflow. Sometimes every 60 days, not every six months, like the old cheap fiberglass ones. A smart thermostat tracking actual blower run hours to tell you exactly when to change the filter can save your expensive blower motor from suffocating and burning out.
C-Wire And Setup Menu Disasters
SPEAKER_01But actually getting these smart thermostats installed correctly is a whole other minefield. The sources outline two massive DIY setup disasters that cause an endless stream of service calls. We definitely need to warn everyone about them.
SPEAKER_00Oh yes, please do.
SPEAKER_01The first one is skipping something called a C-wire, because older thermostats were basically just light switches, right? They didn't need their own power. But a modern smart thermostat is a Wi-Fi computer with a backlit touch screen. If it doesn't have a dedicated common wire, the C-wire, to complete a constant 24 volt circuit, I'm assuming it has to get that power from somewhere.
SPEAKER_00That's the problem. Many older homes don't have a C-wire run through the walls to the thermostat location. When a homeowner tries to install a modern smart thermostat without it, the device tries to power its Wi-Fi chip and its bright screen by essentially acting like a parasite.
SPEAKER_01A parasite.
SPEAKER_00Yeah. It starts siphoning power from the heat or cool call wires.
SPEAKER_01Wait, it's stealing electricity meant for the furnace relay?
SPEAKER_00Exactly, which causes the entire 24 volt circuit to drop. The HVAC system starts to flicker or short cycle, or the furnace relays start shattering erratically. The homeowner assumes their extremely expensive equipment is broken when in reality their fancy new thermostat is just starving for power and crashing the circuit.
SPEAKER_01Wow. And the second mistake is honestly even more painful because it's purely human error. It's what happens when you turn the new smart thermostat on for the very first time and you just impatiently click next, next, next, through the digital setup menu because you want to get it over with.
SPEAKER_00Oh, HVAC technicians see this constantly. During initial boot up, there is a hidden configuration screen that explicitly asks you what kind of system the thermostat is controlling. Is it a heat pump or conventional gas? Is it single-stage or two-stage? Does it have auxiliary heat strips?
SPEAKER_01And if you don't know the answer to those technical questions and you just blindly click through.
SPEAKER_00The thermostat software defaults to the safest, most basic, assumption conventional single-stage logic, which means you now have a highly intelligent $200 thermostat running your brand new $12,000 variable speed heat pump as if it were a rudimentary 1985 furnace.
SPEAKER_01It completely ignores all the variable speed gears. Just turns the machine on 100% or off. You pay for a Ferrari, and you literally program the computer to think it's a U-Haul.
SPEAKER_00Yep. This is one of the most common service calls in the entire industry. A frustrated customer calls, complaining their new system is short cycling, their bills are astronomically high, and the emergency heat is constantly kicking on.
SPEAKER_01They think they got ripped off.
SPEAKER_00Exactly. The technician walks in the front door, goes straight to the thermostat configuration menu, changes three drop-down settings to tell the thermostat what machinery it's actually attached to, and walks out. It's a 30-minute visit that saves the homeowner $80 a month for the rest of
Homework Check Three Key Settings
SPEAKER_00the winter.
SPEAKER_01So, what does this all mean for you, the listener? What is the actionable step you should take today? Well, here is your homework, straight from the experts in the field. Tomorrow morning, walk over to your thermostat, find the exact model number, and Google that number along with the phrase configuration menu or install or setup.
SPEAKER_00You really have to dig into those back end settings.
SPEAKER_01Yes, you need to get into the back end and verify three specific things. First, check the system type, make sure it accurately reflects the machinery sitting outside your house. Second, check your setback band. Make sure you aren't enforcing massive 10-degree swings on a variable speed unit. And third, check the emergency heat lockout temperature. Make sure those expensive toaster coils aren't firing up just because it's a mild 45 degrees outside.
SPEAKER_00And look, if you look at that menu and you have absolutely no idea what you were looking at, do not guess. Call a reputable local HVA shop. Most of them will happily spend 20 minutes on the phone with you, entirely for free, walking you through the menu to ensure it's configured for your specific equipment and your specific climate zone. It is, as Dave Hartzell says, the cheapest tune-up you will ever do.
SPEAKER_01We've covered the mechanical gears, the hidden money traps, and the comfort equation. We know that treating modern tech like old tech is a guaranteed recipe for high bills and clammy
The Bigger Lesson On Automation
SPEAKER_01houses.
SPEAKER_00Yeah, and if we connect this to the bigger picture, it really is a profound realization about how passive we have become with our technology. We blindly trust the default algorithms in our smart thermostats only to find out they are actively fighting the physical equipment they control?
SPEAKER_01It really makes you wonder.
SPEAKER_00It does. This raises an important question. What other smart automations in our daily lives are doing the exact same thing? From our smart appliances running inefficient wash cycles because of default settings, to our automated finances applying outdated logic to a changing economy. How many of our convenient set it and forget it systems? Are quietly costing us behind the scenes simply because we never took 20 minutes to look under the hood at the configuration menu.
SPEAKER_01It really makes you rethink the whole concept of a smart home. You think you've got the whole house managed, everything is optimized, everything is clean and categorized like a perfect digital X-ray. You think you have the ultimate strategy.
SPEAKER_00But you might just be fighting yourself.
SPEAKER_01Exactly. As we learned today, sometimes you have to look past the visible surface, past that sleek touch screen on the wall, and understand the messy, complex reality of the machinery underneath. Because if you don't, that beautifully clear, automated strategy is going to leave you sweating in a 72 degree swamp, paying double for the privilege. Thanks for joining us on this deep dive. Check your settings, and we'll catch you next time.