What I Learned After 1 Year in My Net Zero House

Undecided with Matt Ferrell
24 Sept 202418:19

Summary

TLDRIn diesem Video teilt Matt Ferrell seine Erfahrungen mit dem Bau seines eigenen Hauses, das eine netzneutrale Energieversorgung erreichen soll. Er hat verschiedene Technologien wie Solarpanele, Hausbatterien und eine geothermische Wärmepumpe integriert. Nach einem Jahr zeigt sich er sehr zufrieden mit dem Ergebnis, obwohl es Herausforderungen gab, wie die Planung von Lüftungs- und Versorgungsleitungen ohne Keller. Er diskutiert auch die Kosten und Empfehlungen für effiziente Haushaltsgeräte und wird in einem zukünftigen Video über seine Erfahrungen mit der Energieerzeugung sprechen.

Takeaways

  • 📝 Der Ersteller des Kanals wollte sein Zuhause so gestalten, dass es im Laufe eines Jahres so viel Energie erzeugt wie es verbraucht - also ein Netto-Null-Energie-Haus.
  • 💵 Zu den eingesetzten Technologien und Methoden zählen Solarpanelen, Hausbatterien, eine geothermische Wärmepumpe, eine luftdichte Bauweise und vieles mehr.
  • 📱 Es gab Erfolge, aber auch Herausforderungen und Rückschläge auf dem Weg zum Netto-Null-Energie-Ziel.
  • 💲 Der Hausbau beinhaltete eine Fabrikgebäude von Unity Homes mit hervorragender Isolation und Luftdichtigkeit, eine geothermische HVAC-Anlage, eine Luft-Wärmepumpe-Wassererhitzer, einen Energiewiedergewinnungsventilator (ERV), hochwertige Geräte und Solaranlagen mit Hausbatterien.
  • 💷 Es gab Schwierigkeiten aufgrund früher Bauentscheidungen, wie die Entscheidung gegen eine Kellergrundlage, was die Planung von Installationen erschwert hat.
  • 💶 Ein kürzlich entdeckter Fehler bei der Dachabdichtung hat zu einer unzureichenden Lüftung im Dachraum geführt, was durch zusätzliche Sensoren und später durch Sanierung behoben wurde.
  • 💹 Die Inbetriebnahme der Solar- und Batterieanlagen war schwierig und verzögerte sich, was die Energieerzeugung beeinflusste.
  • 💰 Die Gesamtkosten für das Haus beliefen sich auf etwa 25% bis 30% mehr pro Quadratmeter im Vergleich zu einem traditionellen Einfamilienhaus.
  • 💳 Trotz der Herausforderungen ist das Haus sehr zufriedenstellend und bietet ein hohes Maß an Energieeffizienz, Wärmedämmung und Ruhe.
  • 💴 Die Energieverbrauchsdaten zeigen, dass das Haus effizienter ist als durchschnittliche US-Häuser, insbesondere in Bezug auf Heizung und Klimaanlage.
  • 📰 Es gibt eine separate Folge zum Thema Energieerzeugung, die nähere Informationen über die Solaranlage und die Batterien geben wird.

Q & A

  • Was ist das Ziel von Matt Ferrell beim Bau seines neuen Hauses?

    -Matt Ferrell wollte sein neues Haus so entwerfen, dass es einen netto-Null-Energie-Status erreicht, also so viel Energie erzeugt wie es im Laufe eines Jahres verbraucht.

  • Welche Technologien und Techniken wurden in Matts Haus integriert, um den Energieverbrauch zu reduzieren?

    -Matt hat Solarmodule, Hausbatterien, eine geothermische Wärmepumpe, eine luftdichte Hauskonstruktion und vieles mehr in sein Haus integriert.

  • Wie lange ist es her, dass Matt in sein neues Haus gezogen ist?

    -Es ist ein volles Jahr her, dass Matt in sein neues Haus gezogen ist.

  • Was war das größte Hindernis bei der Umsetzung des geothermischen HVAC-Systems in Matts Haus?

    -Eines der größten Hindernisse war die Planung der Lüftungs- und Versorgungsleitungen im Haus ohne Keller, was die Installation und spätere Änderungen erschwert hat.

  • Welche Fehler wurden bei der Dachabdeckung von Matts Haus festgestellt?

    -Die Dachabdecker haben nur an der Hauptwohnungszone eine Kammlüftung installiert, nicht aber über dem Wohnwagen oder dem Studio und Büro von Matt.

  • Wie hat Matt die Luftqualität und den CO2-Gehalt seines Hauses überwacht?

    -Matt hat Temperatur-, Luftfeuchtigkeits- und Luftqualitätssensoren überall im Haus installiert und verwendet ein Dashboard in Home Assistant, um diese Daten über die Zeit zu überwachen.

  • Was war die Haupthürde bei der Installation von Solar- und Batteriesystemen in Matts Haus?

    -Die Haupthürde war die Installation der Solaranlage, die erst im Oktober des letzten Jahres aktiviert wurde, und die Batterie, die erst im Mai dieses Jahres installiert und eingeschaltet wurde.

  • Wie viel Prozent des Energieverbrauchs von Matts Haus geht auf die Heizung und Kühlung?

    -Im Vergleich zur durchschnittlichen US-Haushalts, der etwa 54% seines Energieverbrauchs für Heizung und Kühlung aufwendet, liegt der Anteil in Matts Haus bei nur 15,4%.

  • Was ist der größte Energieverbraucher in Matts Haus?

    -Der größte Energieverbraucher in Matts Haus ist sein Netzwerkschrank mit 19,2%.

  • Welche anderen wichtigen Energieverbraucher wurden in Matts Haus identifiziert?

    -Die anderen wichtigen Energieverbraucher sind das geothermische System (15,4%), das Laden seines Elektrofahrzeugs (12%), ein ganzes Haus-Dehumidifier (5,5%), der Wasserkocher (5,2%) und die Waschmaschine und Trockner (2,4%).

  • Was würde Matt bei der Planung seines Hauses anders machen, wenn er es heute noch einmal tun würde?

    -Matt denkt darüber nach, ob es besser gewesen wäre, eine Keller zu haben, was die Planung der Lüftungs- und Versorgungsleitungen erleichtern und einfachere Änderungen im Laufe der Zeit ermöglichen würde.

Outlines

00:00

🏡 Ein Jahr im netzwerkneutralen Zuhause

Matt Ferrell teilt seine Erfahrungen im ersten Jahr in seinem neuen Zuhause, das auf eine netzwerkneutrale Energiebilanz ausgelegt ist. Er hat verschiedene Technologien wie Solarpanele, Hausbatterien, eine geothermische Wärmepumpe und airtight Hauskonstruktion integriert. Trotz Erfolgen und Lernprozessen hat es auch Herausforderungen und Rückschläge gegeben. Er diskutiert, was man beachten sollte, um sein Zuhause energieeffizienter zu gestalten, und ob all die Anstrengungen letztendlich sich lohnen.

05:04

🔍 Die Herausforderungen des Energiesparens

Matt Ferrell reflektiert über die Schwierigkeiten, die mit der Energieeffizienzverbesserung einhergehen, und wie man sie meistern kann. Er erwähnt, dass viele Probleme auf frühere Bauentscheidungen zurückzuführen sind, wie die Wahl für eine Sockelfundament-Grundlage, die die Installation von Klimaanlagen und Versorgungsleitungen erschwert. Ferner gibt er an, dass es Schwierigkeiten gab, die Lüftung des Daches richtig einzurichten, was zu Feuchtigkeitsproblemen führen kann. Außerdem beschreibt er, wie er seine HVAC-Systeme und den Energiewiederaufbereiter (ERV) konfigurieren musste, um eine gleichmäßige CO2-Verteilung im Haus zu gewährleisten.

10:04

📊 Die Energienutzung im Vergleich

Matt Ferrell präsentiert detaillierte Daten und Diagramme, die die Energienutzung seines Hauses zeigen. Er verwendet ein Span Smart-Elektrolysepanel, um die Energieverbrauchsdaten stufenweise zu verfolgen. Die Hauptenergiefresser des Hauses sind sein Netzwerkschrank, das geothermische System, das Laden seines Elektrofahrzeugs, ein ganzes Haus-Entfeuchtungsgerät, der Wasserkocher und die Waschmaschine und Trockner. Er diskutiert auch die Herausforderungen, die mit der Verwendung eines geothermischen Systems verbunden sind, und wie er seine Energienutzung im Vergleich zu durchschnittlichen US-Haushalten reduzieren konnte.

15:08

💡 Empfehlungen und persönliche Betrachtungen

Matt Ferrell gibt Empfehlungen für energieeffiziente Haustechnik und Geräte, einschließlich Luft-Wärmepumpen, ventloser Wärmepumpentrockner, Wärmepumpen-Wasserkocher und Induktionskochplatten. Er reflektiert über seine persönlichen Erfahrungen und überlegt, ob bestimmte Entscheidungen wie das Auslassen eines Kellers im Nachhinein besser hätte getroffen werden können. Er betont auch die Bedeutung des Abonnements und der Unterstützung seiner Zuschauer für die kontinuierliche Verbesserung seines Kanals.

Mindmap

Keywords

💡Net zero energy

Es ist ein Ziel, das besagt, dass ein Gebäude so gestaltet wird, dass es im Laufe eines Jahres so viel Energie erzeugt, wie es verbraucht. Im Video wird dies als Hauptziel des Hauses verfolgt, um Umweltbelastungen zu reduzieren und nachhaltige Energienutzung zu fördern. Beispielsweise wurden Solarmodule und Home-Batterien integriert, um die Energieerzeugung zu unterstützen.

💡Solar panels

Solarmodule sind eine Technologie, die Solarenergie in elektrische Energie umwandelt. Im Kontext des Videos wurden sie verwendet, um das net zero energy Ziel des Hauses zu erreichen. Sie sind ein Schlüsselelement in der Energieerzeugung des Hauses.

💡Home batteries

Home-Batterien speichern erzeugte elektrische Energie, um sie bei Bedarf zu verwenden. Im Video wurden sie in Verbindung mit Solarmodulen genutzt, um Energie zu speichern, die nicht sofort benötigt wird und später genutzt werden kann.

💡Geothermal heat pump

Eine geothermische Wärmepumpe ist ein System, das Wärme aus dem Erdboden für Heizung und Kühlung verwendet. Im Video wird sie als Teil der energieeffizienten Technologien erwähnt, die im Haus installiert wurden, um Energiekosten zu senken.

💡Air source heat pump water heater

Dies ist ein Gerät, das Wärme aus der Luft verwendet, um Wasser zu erhitzen. Im Video wird erwähnt, dass es an das geothermische HVAC-System angeschlossen ist, was zeigt, wie verschiedene Systeme im Haus zusammenarbeiten, um Energieeffizienz zu maximieren.

💡Energy Recovery Ventilator (ERV)

Ein ERV ist ein System, das Wärme oder Kälte aus dem ausgehenden Luftstrom wiedergewinnt und sie in den einströmenden Luftstrom überträgt, um Energiekosten für Heizung und Kühlung zu reduzieren. Im Video wird der ERV als die 'Lunge' des Hauses bezeichnet und ist ein wichtiger Bestandteil der Luftqualitätsmanagement im Haus.

💡High efficiency appliances

Hochleistungsgeräte sind Geräte, die weniger Energie verwenden als herkömmliche Modelle. Im Video werden Geräte wie die Waschmaschine, der Trockner, der Kühlschrank, der Geschirrspüler und die Induktionskochköpfe als Beispiele für die Verwendung von energieeffizienten Geräten im Haus genannt.

💡Airtight house construction

Eine dicht gebaute Konstruktion ist ein Baustil, bei dem das Haus so gebaut wird, dass keine Luft durch Spalten oder Löcher entweicht. Dies reduziert die Menge an Energie, die für Heizung und Kühlung benötigt wird. Im Video wird dies als ein wichtiger Faktor für die Energieeffizienz des Hauses betrachtet.

💡Energy use and efficiency

Energieverbrauch und Effizienz beziehen sich auf die Menge an Energie, die ein Haus verbraucht, und wie effizient diese Energie verwendet wird. Im Video wird dies als ein Hauptthema behandelt, indem die verschiedenen Maßnahmen und Geräte diskutiert werden, die eingesetzt wurden, um den Energieverbrauch zu reduzieren und die Effizienz zu erhöhen.

💡HVAC

HVAC steht für Heizung, Lüftung und Klimatisierung. Es ist ein System, das verwendet wird, um die Temperatur und die Luftqualität im Haus zu steuern. Im Video wird die Herausforderung beschrieben, das HVAC-System und den ERV so zu betreiben, dass ein konsistenter CO2-Gehalt im ganzen Haus erreicht wird.

💡Induction cooktop

Ein Induktionsherd ist eine Art Herd, der Elektromagnetismus verwendet, um Geschirr direkt zu erhitzen, anstatt die Luft um das Geschirr zu erwärmen. Im Video wird der Induktionsherd als schneller und effizienter als herkömmliche elektrische Herde beschrieben und wird empfohlen, da er weniger Energie verbraucht.

Highlights

Matt Ferrell's goal to achieve net zero energy status for his forever home.

Incorporation of solar panels, home batteries, geothermal heat pump, and airtight construction for energy efficiency.

A year of successes and setbacks in the pursuit of net zero energy.

Rapid fire list of energy-efficient home features including factory-built home, geothermal HVAC, and high-efficiency appliances.

Extreme satisfaction with the home despite imperfections and potential improvements.

Challenges faced due to construction decisions, such as choosing a slab-on-grade foundation.

Mistake in roof venting leading to humidity issues, and subsequent corrective measures.

Learning curve in managing HVAC and ERV for optimal CO2 levels.

The struggle to get solar and battery systems installed and operational.

House construction cost was 25% to 30% more per square foot than traditional builds.

House airtightness close to passive house standards with a blower door test result of just below 0.6 ACH/50.

House insulation levels with R-35 walls and R-60 or R-65 attic.

Geothermal HVAC system requires a 'set it and forget it' approach for efficiency.

ERV setup challenges in an airtight house and the solution of continuous HVAC fan operation.

Detailed energy use data revealing the top energy-consuming systems in the house.

Comparison of energy use with previous house and community averages showing significant savings.

Recommendations for future builds including considering a basement for easier modifications.

Recommendation of air source heat pumps, ventless heat pump dryers, and heat pump water heaters for energy efficiency.

Matt's personal recommendation of an induction cooktop for faster cooking and energy savings.

Anecdotal evidence of the house being comfortable and quiet, contributing to the net zero energy goal.

Transcripts

play00:00

If you’ve been following my channel  for a while, you’ll know that I built  

play00:02

my forever home with the goal of reaching  net zero energy status. In other words,  

play00:06

I wanted my home designed so that I produce as  much energy as I use over the course of a year.  

play00:11

To get there, I incorporated a bunch of gadgets  and techniques into my plans, like solar panels,  

play00:16

home batteries, a geothermal heat pump,  airtight house construction, and much more. 

play00:21

Well, it’s been a full year since I moved  in. There've been a lot of successes as I’ve  

play00:24

worked toward my net zero energy goal, a lot of  learning … and some hiccups and setbacks too.  

play00:30

It’s been a real watt-and-see kind of journey. So, if you want to make your home more  

play00:33

energy-efficient, what should you look out for  and what strategies should you try? And then  

play00:37

there's the lingering question … was all  of my effort really worth it in the end?

play00:41

I’m Matt Ferrell … welcome to Undecided. 

play00:46

This video is brought to you by  Incogni, but more on that later.

play00:49

I won’t rehash the whole house build story. You  can watch the playlist I’ll link to here and in  

play00:54

the description. In a nutshell, my wife and  I outgrew our previous house and I suggested  

play00:58

that we try building a home using all the tech  and techniques I’ve been talking about on the  

play01:02

channel for the past several years. Basically,  I wanted to walk the walk and see how well a  

play01:07

lot of this stuff actually works for myself.  Here’s a rapid fire list of what that entails …

play01:12

A factory built home from Unity Homes with  incredible insulation and air tightness. 

play01:16

A geothermal HVAC system for  heating and air conditioning. 

play01:19

Air source heat pump water heater  tied into the geothermal HVAC system. 

play01:23

An Energy Recovery Ventilator  (ERV) as the “lungs” of the house. 

play01:26

High efficiency appliances  like our washing machine,  

play01:29

ventless heat pump dryer, refrigerator,  dishwasher, and induction cooktop. 

play01:33

And, of course, solar panels with home  batteries for energy generation and storage.

play01:38

Before I get into all the nerdy details of  what’s happened, what’s worked, and what hasn’t,  

play01:43

the TL;DR for my home is that we’re extremely  happy with this place. It’s not perfect,  

play01:47

and there are things I would have done  differently, but this home has been  

play01:51

fantastic for us. This is also being broken  up into two videos: this video is about energy  

play01:55

use and efficiency. The other will be focused on  our energy generation and how that’s worked out.

play02:01

What about the challenges? Well, most of  the issues that have come up all tie back  

play02:04

to some of the construction decisions we made two,  

play02:07

three or even four years ago when  this all started. For instance,  

play02:10

we wanted to save some money on different areas  of the build so we could put that money into other  

play02:14

features we wanted more. We decided to go for a  slab-on-grade foundation — basically, we built a  

play02:20

house with no basement. So, if we ever need to  hide from zombies, we’ll have to get creative.

play02:25

While there’s nothing wrong with slab-on-grade,  it does complicate some things. You really have  

play02:29

to plan ahead for how and where you’re  going to run HVAC ductwork, plumbing,  

play02:33

electrical, home networking, and  so on. You want to limit how many  

play02:36

intrusion points you have through  the thermal envelope of your house.

play02:39

With a basement as part of your thermal envelope,  

play02:41

you have an easier time routing all of those  things under the main floor … and adding on  

play02:46

to them later. We had to plan for all  of that upfront, which does limit how  

play02:50

easily we can modify things later without  puncturing that airtight thermal envelope.

play02:55

One issue that I discovered more recently was a  mistake or miscommunication between my general  

play02:59

contractor and the roofers when building my  house. According to the construction documents  

play03:04

from Unity Homes, my roof should have had ridge  vents along all the sections of the house. This  

play03:09

is important to ensure proper airflow within the  attic spaces to prevent humidity build up. Hot,  

play03:14

moist air exhausts through the ridge vent at the  top of the attic space, while fresh outside air  

play03:18

comes in through soffit vents lower down. Nobody  wants black mold growing in their attic space.

play03:23

Well, the roofer only put a ridge vent along  the top of the main living area of the house.  

play03:27

They didn’t do it along the connector or above  the garage and my studio & office. As soon as  

play03:32

I spotted the issue, I let our contractor know,  and they’re in the process of making it right.  

play03:36

By the time you’re seeing this, the roofers  are coming back and adding those vents. But,  

play03:39

in the meantime, I stuck some humidity and  temperature sensors in the different areas  

play03:43

of my attic space and confirmed that there’s a  distinct difference when there’s proper venting.  

play03:47

The main area of the home with the ridge vent has  a smaller temperature and humidity gradient than  

play03:51

the other attic spaces, and it also runs with  a lower humidity and temperature level overall.

play03:57

There was also a learning curve around the  best way to run my HVAC system and ERV to  

play04:00

get consistent CO2 levels throughout the  house. Me being me … I have temperature,  

play04:05

humidity, and air quality sensors everywhere.  I have a dashboard built out in Home Assistant,  

play04:09

so I can see how all of this looks over time.  

play04:11

It’s been super helpful. I’ll get into  those results in just a minute though.

play04:15

The biggest challenge, which I’ve talked about in  previous videos about my solar and battery setup,  

play04:19

was just getting the solar and battery stuff  installed. My solar didn’t get activated until  

play04:24

October of last year and my battery didn’t  get installed and turned on until May of  

play04:28

this year. I’ll be getting into how the solar  is working specifically in the followup video.

play04:33

So, how do the results for the  house look at a high level?

play04:35

Before getting into those results,  there’s another tool I’ve been using  

play04:38

that’s been getting fantastic results for  me … and actually helped out a lot with  

play04:41

our move into this house. That’s protecting  your online privacy with today’s sponsor,  

play04:45

Incogni. As my wife and I were getting our house  constructed, setting up loans, getting insurance,  

play04:50

and everything else you have to do with moving,  I saw a major uptick in the amount of spam  

play04:55

promotional emails I was getting. I’m sure you’ve  experienced this kind of thing too. That happened  

play04:59

because companies sold my information to data  brokers ... sometimes they sell your info to  

play05:03

some pretty shady people. Or they can fall victim  to data breaches that leak your data to scammers.  

play05:08

Incogi can help with this. We have the right to  request that data brokers delete our information,  

play05:13

but it takes a lot of time and effort. I signed up  for Icogni, gave them the legal right to work on  

play05:17

my behalf, and then … just sat back and relaxed.  You’ll see updates on your account for which data  

play05:22

brokers they’ve sent legal requests too and which  ones have complied. It couldn’t be easier. Incogi  

play05:27

really has been helping me. If you want to take  back some of the control around who has access  

play05:30

to your personal information, give Icogni a try.  Take your personal data back with Incogni! Use  

play05:35

code UNDECIDED at the link below and get 60% off  an annual plan. Thanks to Incogni and to all of  

play05:41

you for supporting the channel. So back to how the  results of my house are looking at a high level.

play05:45

I need to address the elephant in the room first,  which is the cost of the house. I’m not going to  

play05:50

share the exact costs of building the house  because real estate and building costs vary  

play05:54

state to state and town to town by so much.  However, percentage-wise we paid roughly 25%  

play06:00

to 30% more per square foot than a traditional  house built to code standard. It’s difficult  

play06:04

to nail that down specifically, though, because  of when we built it. It just so happened to be  

play06:08

during the initial surge in pricing that  we saw during the pandemic. Bad timing. 

play06:15

Setting that aside, the most important  thing for any house when it comes to  

play06:19

maximizing your energy savings is its general  efficiency. How good is the insulation and air  

play06:24

tightness of the home? For a building to hit  the passive house standard of airtightness,  

play06:28

you have to achieve a pressure test of 0.6  air changes per hour or lower at 50 pascals  

play06:33

of pressure (referred to as ACH/50). We achieved  a blower door test just below 0.6 ACH/50 during  

play06:39

a mid build test, and got very close to  that again in the final blower door test.

play06:44

Now make no mistake, this isn’t a passive house  certified home — that was never my goal. But it  

play06:49

is much closer to that level of home than a  “to code” built house. The insulation level  

play06:54

of our walls is R-35 along with triple glazed,  tilt turn windows, which are super efficient.  

play06:59

And I believe the attic has an R value of around  R-60 or R-65. To say this house feels consistent  

play07:05

temperature-wise would be an understatement.  There’s no cold spots or warm spots.

play07:10

It’s also very quiet in the house. While  my wife was under the impression that this  

play07:14

house would be a tomb when it comes  to noise, that’s not the case. We can  

play07:18

still hear the loudest trucks as they  drive by on the road behind our house,  

play07:21

but it’s very muted. This is hands  down the quietest house I’ve lived in.

play07:26

My WaterFurnace geothermal HVAC system  has taken a little getting used to.  

play07:30

I’m more accustomed to the standard forced air  systems that you typically see here in the US.  

play07:34

Typically, you have a smart thermostat  where you adjust timers, temperature,  

play07:37

and fan settings dependent on whether people are  home or not, like dropping the heat if the house  

play07:42

is empty, or even dropping the temperature  at night during the winter to save energy.

play07:46

Well, with a geothermal system, you don’t  really want — or need — to play the thermostat  

play07:50

game of “how low can you go?” It’s more  of a “set it and forget it” situation,  

play07:54

like Ron Popeil’s rotisserie  but with less infomercial flair.  

play08:02

It’s better to let the geothermal  ground loop get equalized and just run.

play08:06

My geothermal well is a single loop going down  about 400 feet into the ground in my backyard.  

play08:10

Inside the house, heat is captured and cycled  through the ground loop to cool things off  

play08:14

for summer air conditioning. In the winter, the  warmth of the earth is cycled into the house for  

play08:18

heating. If you try raising and dropping the  inside temps by time of day or by occupancy,  

play08:23

it’s going to take a longer time to  ramp up to the desired temperature.

play08:27

The system is most efficient  when it’s running at temp.  

play08:29

That means you’ll be using more energy trying  to race to a moving temperature setting versus  

play08:34

just leaving it set for longer stretches of  time. It’s kind of counterintuitive. My wife  

play08:39

and I decided to take a “set it and forget it”  approach for the first year in the house. We  

play08:43

set the desired temperature range to 72 to 75 F  (22 to 23 Celsius) and just let the system take  

play08:50

care of itself. I did try setting the HVAC fan  to specified run times to try and cut down some  

play08:55

energy use. However, our Energy Recovery  Ventilator (ERV) setup complicated this.

play09:00

One of the challenges with a super airtight house  is how to control cycling in fresh outside air  

play09:05

while exhausting stale inside air out. You  don’t want to lose all that energy you put  

play09:09

into heating and cooling your inside air as  it leaves your house. The ERV does this by  

play09:14

exchanging that heat between the inside and  outside air before it comes into the house.  

play09:18

Inside and outside air pass through little  microchannels running alongside each other  

play09:22

to make this happen. The ERV has dedicated  exhaust vents in certain areas of the house.

play09:27

However, the ERV air pulled in from the outside  doubles up on the HVAC system’s ductwork vents  

play09:31

to distribute it throughtout the house. An ERV  having its own dedicated lines for both intake  

play09:36

and exhaust gives you a lot more control and  is ideally what you want. The way mine is set  

play09:41

up definitely works, but some of the control  is limited. What I found was that the ERV fan  

play09:46

running at its normal low levels didn’t  have enough force to properly distribute  

play09:50

the fresh air consistently throughout the  house. The CO2 levels in some areas of the  

play09:54

house would get a little higher than I’d like.  I ended up setting the HVAC fan to continuous,  

play09:58

so it’s running 24/7 at a very low level as a  baseline and it solved the ERV air distribution  

play10:04

issue. I was concerned about how much energy this  would all use … so how did that end up looking?

play10:09

Strap on your nerd hardhats, because I’m about  to drop a lot of data and graphs on your head.  

play10:13

I found the energy use of my house absolutely  fascinating, especially when I compared it to our  

play10:18

previous house and community averages. For energy  tracking I have a Span smart electric panel, so  

play10:23

I have circuit-by-circuit energy use. Most of my  appliances and systems also have their own energy  

play10:27

use tracking as well, like WaterFurnace’s Symphony  app or my Rheem water heater’s EcoNet app, but I  

play10:34

really only used those to verify my Span panel’s  numbers. I also have smart outlets and my Span  

play10:38

integrated into Home Assistant, which adds yet  another way I can track and double-check my data.

play10:43

The one caveat to what I’m about to share is  that it isn’t a full year of data. It’s only  

play10:46

from October of last year because my Span panel  setup had an issue for the first couple of months.  

play10:52

Basically, my two Span panels were incorrectly  associated inside my app. The app thought each  

play10:57

panel's circuits were associated with the  opposite panel. It wasn’t a Span problem,  

play11:01

but a problem when the electrician first set  them up in the app. It meant the numbers were  

play11:05

all screwed up for about six weeks.  That got corrected in October. Just  

play11:09

in time for Halloween, because nothing’s  scarier than inaccurate energy data.

play11:13

Let’s look at the data I do  have between October and now,  

play11:16

or about 10 months’ worth. The top  energy sinks of the house were:

play11:20

My network closet at 19.2% The geothermal system at 15.4% 

play11:25

Charging my EV at 12% A whole-house dehumidifier at 5.5% 

play11:29

Water heater at 5.2% And the washer and dryer at 2.4%

play11:34

The rest is made up of other odds and ends, but  interestingly the ERV only accounts for 1.6%,  

play11:40

which is much lower than I expected. Considering  the average US household has about 54% of their  

play11:45

electricity use going towards heating and air  conditioning, my 15.4% seems REALLY low. But  

play11:52

what the heck is going on with my network closet?  It's like the Bermuda Triangle of energy use!

play11:57

That said, I would be lying if I said my  network closet is normal. I have a server  

play12:01

rack with multiple Ubiquiti network switches, a  Unifi network video recorder (NVR) with a bunch  

play12:06

of Unifi Protect security cameras around  the outside of the house, and Qnap network  

play12:10

attached storage (NAS) for archiving all of  my video footage used in my videos. Basically,  

play12:14

I run a business out of my home, so there’s a  lot of gear in there that the average house isn’t  

play12:19

going to have. I did manage to cut my network  closet energy use by 35% a few months ago,  

play12:24

and there’s a few other things I’m going to be  trying to get it down even more. BUT … if I want  

play12:28

to compare my energy use in a way that’s  more apples to apples to a typical house,  

play12:32

I need to remove my network closet and EV from  the mix. If I do that, things change a bit.

play12:38

Now my geothermal system is at 22.3% A whole house dehumidifier at 8.1% 

play12:44

Water heater at 7.5% The washer and dryer at 3.5% 

play12:48

And the ERV at 2.3%

play12:51

My heating and air conditioning still comes in  well under half the typical house. I don’t have  

play12:55

good data for my previous house as a comparison  for a pretty dumb reason. I forgot to export my  

play13:02

Span smart panel data from the old house before  I lost access to that panel. Like I said … dumb.  

play13:10

But I can do an apples to oranges comparison with  just the amount of natural gas our old system used  

play13:14

for heating alone. We averaged the equivalent  of about 500 KWh a month for natural gas heat.  

play13:21

My current geothermal average of 193 KWh a  month for heating AND cooling (including the  

play13:27

electricity to run the HVAC fans) is still only  39% of my old house’s natural gas energy alone.

play13:34

That’s the one-two punch of my geothermal system  efficiency with a well insulated, air-tight  

play13:39

house. And for those of you wondering what “heat  backup” is? I have no idea (yet), but I do know  

play13:45

that it’s not directly related to my geothermal  system. It’s how it’s labeled in the Span app,  

play13:49

but I’m still trying to figure out what it  actually is considering it’s 4% of my energy use.

play13:54

What’s even more interesting to me is my hot  water. It’s not only more efficient because it’s  

play13:58

a heat pump water heater, but it’s also tied into  my geothermal desuperheater. It’s using the waste  

play14:03

heat from the HVAC system to help preheat water  into a holding tank. On average we’re using about  

play14:08

65 KWh a month for hot water. In my old house we  used natural gas, but you can convert gas therms  

play14:14

to KWh (1 Therm = 29.3 KWh). On average, we used  the equivalent of 398.9 KWh per month. That means  

play14:25

we’re using only 16% of the energy we used in the  old house to generate hot water. That’s just nuts.

play14:30

What would I have done differently? Nothing  too dramatic, but I have wondered if it would  

play14:34

have been better if we had opted for  a basement. It would have simplified  

play14:38

a lot of the headaches we ran into trying  to preplan all of the HVAC, electrical,  

play14:41

and networking runs. It would also have given  us easier access to make modifications to that  

play14:45

stuff over time without having to worry about  possibly compromising the air-tight envelope.  

play14:50

Another would-be bonus: extra climate-controlled  storage space … but maybe it’s a good idea we  

play14:55

don’t have that. Keeps us from turning into  contestants on “Hoarders: Net Zero Edition.”

play14:59

As much as I love our geothermal system, it  was pretty pricey. I have details on that in  

play15:03

my previous geothermal video you’ve probably seen  if you’re subscribed. Speaking of subscribing,  

play15:08

I know from my YouTube analytics that a  significant number of you that watch on  

play15:11

a regular basis still aren’t subscribed, or  thought you were but actually aren’t (I hear  

play15:16

that a lot from some of you). Subscribing and  hitting the notification bell not only helps  

play15:20

you not miss a video, but it also helps out the  channel with the mighty YouTube algorithm gods.

play15:24

As far as the geothermal cost, we were building  our forever home and we’ll hopefully be here for  

play15:29

decades. Spending a little more upfront to  get the long-term benefits was worth it to us,  

play15:34

but your mileage will vary there. Air source  heat pumps are absolutely superb today … and yes,  

play15:39

they do work in the cold. I’d recommend  going at least with a quality air source  

play15:43

heat pump setup because it’s just  going to blow away any natural gas  

play15:47

or standard electrical system you  can get. Granted, electricity and  

play15:50

natural gas prices will vary how much of a  financial gain you’ll get in that equation,  

play15:54

but you will come out ahead over time. It’s  just by how much that’s the open question there.

play15:59

I’d also STRONGLY recommend a ventless heat  pump dryer if you can find one that fits your  

play16:03

needs. They’re dramatically more efficient  than a standard electric dryer. My wife and  

play16:07

I are using about 31 KWh on average per month  running both our washing machine and heat pump  

play16:13

dryer. Dryers that vent outside of your home are  ejecting a lot of conditioned air from inside your  

play16:18

home. Not only is it using more electricity  than a heat pump dryer (~3000W vs. ~800W),  

play16:25

but it’s forcing your HVAC system to work  harder to recondition your home. Yes,  

play16:29

a heat pump dryer may take a little more time  to get the clothes dry as you like, but it’s  

play16:34

using a fraction of the energy and not exhausting  conditioned air outside your house on top of that.

play16:39

And, to continue my trend of recommending  a “heat pump all the things” strategy,  

play16:44

I’d also highly recommend going with a  heat pump water heater when it’s time to  

play16:47

replace your old one. You can check out my  previous video on the ins and outs of them,  

play16:51

but in a nutshell … they work well and  will save you a lot of energy and money.  

play16:55

Mine paired with the geothermal system is  incredible. I’m really happy with the results.

play17:00

Lastly, we’re also really liking our induction  cooktop. I’ve talked about these in a previous  

play17:04

video too, but after living with one for the  past year … I love it. It heats up far faster  

play17:09

than any other electric cooktop I’ve ever used.  And much like cooking with natural gas, when you  

play17:14

turn it off … it’s off. It brings a pot to a boil  faster than any stove I’ve ever used, so again,  

play17:20

I highly recommend it. Faster cooking means less  time running and using electricity. It’s also a  

play17:26

great warning system for when my cat is walking  across the counter. Her feet activate random  

play17:31

capacitive buttons as she walks across them.  When we hear a random beeping, we know it’s her.

play17:36

As for my goal of hitting net zero energy,  meaning generating as much energy as I use  

play17:40

over the course of year, I’ll be getting into that  in a separate video. I kind of need that to give  

play17:45

the final assessment of “was this worth it” — so  be sure you're subscribed with notifications to  

play17:49

not miss that one — but from a more anecdotal  point of view, this is the most comfortable  

play17:53

and quiet house I’ve ever lived in. I can say  now that my house is super energy efficient,  

play17:58

so it’s definitely pulling its weight to  help me achieve that net zero energy goal.

play18:02

But what do you think? Do you have any experiences  you can share using similar tech or approaches?  

play18:07

Jump into the comments and let me know and  be sure to listen to my follow up podcast  

play18:10

Still TBD where we’ll keep this conversation  going. Thanks as always to my patrons for  

play18:14

your continued support … you really help to keep  this channel going. I’ll see you in the next one.

Rate This

5.0 / 5 (0 votes)

Etiquetas Relacionadas
EnergieeffizienzNachhaltigkeitSolaranlagenWärmepumpeWohnungsbauTechnologieUmweltschutzEnergiespeicherEnergieautarkieÖkologie
¿Necesitas un resumen en inglés?