Harris Berton

Yeah there's a best of both worlds here where the resistance is there as true "backup" and/or for comfort features, but isn't used on the peak day.

Yeah I mean I just wanna show the principle, timelines are a whole other thing.

Hmmm forgot about reheat dehumidification, and my contractor is a carrier guy too.

The avoiding resistance is really about policy and avoiding a panel upgrade. I want to prove a point about how we can minimize peak demand with well sized heat pumps with enough duct capacity. Maybe 3kW still though

Marginally doubtful the marginal improvement in COP relative to sizing an air source heat pump to full load is worth it, but gotta do the math.

Yeah even then. Hydro Quebec could make a ton of money on market or on firm contracts if their winter peak capacity wasn't so tied up by domestic resistance, but need proper sizing for there to be much benefit to the utility.

It's kind of a point of principle 😅 home electrification that relies to heavily on it is a non starter at scale IMO.

Yeah. This is trending towards a 2 ton unit, but will all depend on what the spec sheet says at -25C. Usually there is some drop off by then, and all the way down to 50% of capacity at -30C (though getting better all the time).

I tested the "no backup" on my hybrid! It works great so long as you have the duct capacity - that's the big caveat. In small homes with way oversized furnaces like mine, I bet it will be fine most of the time. Harder for home >1500sqft.

Well I don't know what model my contractor will want to install, but I would expect it would be at least as good as my old one. But yeah, I would need to verify it was a model that held it's output at -23, OR I will need a 2 ton OR like 3kW of resistance backup (trying to avoid this on principle).

My 40k furnace ran 30min/hour last night, it's 90% efficient. Temps were -18C to -22C over 14 hours (roughly between ASHRAE 99.6% and extreme).

2 tons safer but looks unnecessary?

@energysmartwv.bsky.social think I can get away with 1.5? no resistance backup? (700sq ft main, 700sqft basement)

Shows furnace runtime last night at 30min/hour until 5am

Shows furnace runtime data the day before

That's what high quality sizing data looks like!

Sadly had to sell my home with a hybrid heat pump, but the new house is a great opportunity fully electrify with high quality load data! Think I can do 1.5 tons with no backup!

#heatpumps

It is possible to think higher avg fares are better, why not be clear what you mean?

The other questions are rhetorical in the sense I'm asking you to engage with the tradeoffs of what you're proposing. You can say "yes or no" and then expand, or just expand.

Your position is clear but your justification isn't. My questions are direct, you can answer them as yes or no, or expand on the nuances. You're avoiding them since they undermine your lazy policy prescription.

Graph of heatpump combo washer dryer energy use showing $3/mo in electricity costs. Roughly $0.25/load.

I don’t have a great baseline of what our electric 240V dryer + washer used to pull, but I was pretty surprised to see our #heatpump combo washer/dryer only uses $0.25 cents per load in electricity. And eliminated a building envelope penetration further improving our heating load.

#energysky

Using a heat pump dryer/washer combo is an awesome way to help simplify electrification projects! Though I am increasingly an advocate of avoiding heat kits if possible in Canada to minimize peak load.

You also didn't really answer my question.

To be clear, you think that:

1) higher average fares are better,

2) you could always get a taxi during high volume periods,

3) taxi drivers respected traffic laws,

4) taxi drivers made a decent living before Uber,

5) that taxi profits didn't go to a small number of wealthy individuals?

So you thought multi-hundred thousand dollar taxi license medallions were good for consumers and drivers?

Yep hybrids are very useful in that regard.

I mean we still have some fairly significant techno-economic challenges/opportunities to address, but yeah...lol

Tech is easy, institutions are hard!

In Canada they are, and the push is for hydrogen/RNG hybrid system.

Don't see a major issue with tanks in urban areas? I see some economic barriers depending on heat pump tech progress but technically shouldn't be an issue?

Naw even for a relatively small share (e.g. 5%) it's an issue (certainly in my country). Unless we can gasify wood it's tough, and even then...

And even THEN, you still have a low network utilization issue to content with.

Yeah I think on site tanks are the default if we can't make the electrical peaks manageable. DE where we can manage it, but still need to fuel them. You can do some cool stuff with mixed loads and low temp heat loops plus (very large) cold climate units.

Not enough bioresources for that, even hybrid advocates in Canada acknowledge this. Would have to be offsets or (shudder) pure hydrogen.

Yeah but there was a business case that isn't there for BC, expensive power to get people off baseboards and expensive oil to get them off furnaces. But agreed, supply chains can emerge quickly with the right incentives.

If there's a death spiral yes...this is why work like @gruberte.bsky.social's on mid transition dynamics is going to be so important.

R290 and heat pumps sized to load can help a lot! No such option for gas.

In BC Chris...we could start sizing heat pumps to load TODAY without much issue using cold climate units. It feels counterintuitive in BC but they'll have so much value to the electricity system if we have incentives or some kind to do that.