[archi42]

If you aimed to reduce your heat requirements further you can either improve the insulation or reduce your living space (or add a person to improve efficiency :P).

For comparison, we're currently working on our home (bought last year around this time). The new insulation will be U=0.1455 for walls & roof (R-68?) and U=0.29 to the basement. I don't recall the values for windows & the front door. We'll also replace oil with a heat pump and add a ventilation system with heat exchanger. And we only have 1500sqft for two (no additions planned). That will probably be still miles away from those 2kWh/d/person, but much better than the status quo (~2.5kW of heat alone, per person).

Obviously you're already in a good ball park, but GPs value of 2kWh/d/person is just really amazing.

[danans]

> Obviously you're already in a good ball park, but GPs value of 2kWh/d/person is just really amazing.

It's 2kW/person, or 2kWh/h/person, or 48kWh/d/person

[archi42]

You are of course right, 48kWh/d/person is what the article is all about (& I'm perfectly aware of that).

But as GP[0] replied to GGP

> 2 kWh/day seems crazy low

I was under the impression that he was actually pondering a much better personal energy consumption of 83W/person. And yeah, I'm inclined to say that (with our current level of technology) achieving this number without lowering standard of living might be nearly impossible in many climate zones.

The rest of my comment is more generic.

[0] GP: https://news.ycombinator.com/item?id=32911031