Nate the House Whisperer Profile picture
Feb 3 • 16 tweets • 3 min read
Story Time - Advocating apolitically for #electrifyeverything

A thread. 🧵

Pulled from the Electrify Everything group. bit.ly/ElectrifyEvery… Image
I arrived in Des Moines last night for the Momentum Is Building conference.
I grabbed a cab and naturally we got to chatting. I LOVE cab drivers because they are full of so much local information. 2
He naturally asked what I'm here for. I told him a building science conference. He asked what BS was and I told him the physics of how a building works, which tends to end conversations but neither of us had anything better to do so we kept going. 3
He then asked me if there was anything really behind this green BS (not meaning building science.) He mainly meant building codes.
I instantly had a pretty good idea of where he's coming from, so I asked how he felt about wind turbines. He said he loved them. 4
I told him the costs of wind, solar, and batteries are all down 70-90% in the last decade, so they have moved faster than any of our perceptions can keep up, and it is now the cheapest form of energy mankind has ever known. 5
Economics tend to cross the political spectrum well. If the economics make sense, the solution generally makes sense. 6
We then discussed heat pumps a bit and I used my usual line about how there's heat coming out of the bottom of a refrigerator even though it's cold inside, so there is heat to remove from the cold air. 7
Then translated this to an air conditioner that can run backwards and pull heat from the cold air outside. 8
Then I told him the last decade has seen spectacular development in heat pumps so they now provide much better experiences than they did in the past and are similar in operation costs to gas. 9
I asked him about if he'd rather have 10 gallons dumped over his head or a 5 minute shower - which illustrates that gradual output leads to better comfort. 10
Heat pumps do a better job of this, so used correctly provide better comfort than furnaces. That illustration works amazingly well. 11
Then I told him about @Silas Hoeppner who lives here in town and has a hybrid. When he saw that gas costs were doubling this winter he set up his hybrid to lean hard on the heat pump instead of the furnace. While most heat bills are doubling this winter, his are only up 4%. 12
I asked questions and met him where he was. We closed the conversation with his question about what will happen in 20 years. I told him we'll all have heat pumps. He accepted that despite his early objection to "green BS." 13
I'd avoided a whole bunch of political landmines and spoken in his language of economics and practicality. I spoke in mainstream market terms. 14
He said he'd look into heat pumps the next time he bought HVAC.

How can you have similar apolitical conversations that meet people where they are without judgement? 15

The End
PS To be fair I'm also a midwesterner and politically centrist, so I'm used to his way of thinking. I've always enjoyed learning about cultures and how to fit in, it's fun to use that training.

50% of resi US gas use is in 9 states, basically the midwest. Adapt messaging to it.

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More from @energysmartwv

Jan 22
Thread 🧵

20 kWH of battery goes a long way.

Beyond the heat pump usage, I needed 14.4 kWH of resistance to get through a very cold night here, at design temp 10F.

This is usage from my house last night. Bosch heat pump set to 2 tons max. 5 kw backup on the air handler.
This is measured with an Emporia Vue energy monitor.

A heat pump uses about 1 kWH per hour per ton when running at 100% as mine has.

I’ve watched a number of client homes, 20-50 kWH is enough to load shift all of them so far to make up for resistance usage on cold days.
With batteries this size on homes, the existing grid can handle a lot of electrification with few upgrades.

Add 3-5% per year capacity expansion and concerns largely vanish.

Batteries still have a long way to go on cost curves (unlike hvac). Real focus here is needed.
Read 11 tweets
Dec 21, 2021
Electrification in US climate zones 1-4 is pretty straightforward. Often insulation upgrades aren’t strictly required.

In climate zones 5-8 it’s much trickier. Shell upgrades are often required to keep operating costs down.

~50% of resi gas use is in 5-8.
At present insulation upgrades don’t result in predictable resale value increases.

Until this changes, don’t expect scale in retrofits. 150-200k/year maximum.

The solution is simple: publish energy use at resale.

My 2016 article still holds: bit.ly/EUIonGTM
In the short term, hybrids can help any home reduce gas use 30-90%.

Hybrids (heat pump plus furnace) also get contractors and consumers used to heat pumps so full electrification is less scary.

Fairly cheap policy can drive this: bit.ly/3Hprogram
Read 6 tweets
Dec 20, 2021
First experiences with induction are really important.

Here's a recent review of our Ohio house, note their experience.
What if there were thousands of homes like this? How fast could #electrifyeverything spread? @Airbnb could help a lot with a new class: bit.ly/AirBnbElectrify
While part of me hates that we are taking 2 housing units off the market in WV right now, we're giving them much needed love after 20-30 years of neglect that doesn't pencil if they were long term rentals, so we're improving and electrifying old housing stock. Important note.
Read 7 tweets
Nov 30, 2021
This is what code enforcement looks like.

2015/2018/2021 IECC (insulation codes) are all good enough.

But they’re not enforced, and it’s gonna be TOUGH.

But some are looking for opportunities like this fellow. Image
It’s really tough to fudge leakage tests, so it’s a key tool.

Although duct leakage in northern homes with ducts in heated space doesn’t matter all that much. While home air leakage does.

Down south with ducts in attics, both duct and home leakage matter.
Most southern new home duct systems are abortions btw. Kinked flex duct with almost no flow that get drywalled into the ceiling and can’t be replaced without nearly gutting the house. Passes the test though…

Energy use will tell the tale of bad installs though…
Read 4 tweets
Feb 19, 2021
THREAD:

Homes as thermal batteries aka resilience.

This house dropped 20 degrees in 8 hours in similar 30-40F temps during the Hurricane Sandy outage in 2012. It took 2 days to recover.

Post project it took 26 hours to drop 10 degrees.

@lloydalter
This is a ~2000 sf 1950s Cape Cod in Cleveland Heights.

Full case study on the insulation and air sealing project we did here. It was about $20K and was focused in the attics of this house (it has 4, or was it 5?)

bit.ly/1959CapeCaseSt…
The house started off really leaky at 5800 cfm50 blower door. We got it down to 3100 cfm50. Still not great, but far better. And good enough it turned out.

The house fundamentally changed. The second floor wasn't 10 degrees warmer in summer anymore, it was within 2-3 degrees.
Read 16 tweets
Feb 17, 2021
Tight well insulated homes perform well, exhibit A:

This 5000 sf new home in Cleveland with an 80kbtu 98% furnace and 4 ton heat pump is only at 67% capacity at 8F. That’s about 53kbtu/18kw output.

A 4 ton heat pump would be appropriate here. For a huge house! ImageImage
As we discuss resilience, air tightness is important. This house clocked a 1025 cfm50 blower door or about 1 ACH50.
Exhibit B: 2300 sf 1950 built ranch. 3 ton heat pump. 2000 cfm50. This heat pump shuts down automatically below 3 F. 5 kw/15,000 btus of backup heat is handling the house at this moment. ImageImageImageImage
Read 5 tweets

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