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It's been a while I hope it's not too late to comment.

In Europe a lot of progress is being made in building passive houses or 'nearly zero emission housing" that is to be an EU standard by 2019/21 (public/private). Of course Europe builds very little housing compared to its stock, so the larger issue is renovation which is man power intensive (expensive) and there are limits to insulation. Other issues are what to do with district heating systems that may become uneconomical due to lower volumes having to shoulder the same system losses. Lower temperature systems add new issues all of which means innovation is being fed by regulation and high energy prices (mostly taxes of course).

I'm quite optimistic that renewables, heat pumps and very efficient housing combined is going to make economic and technical sense though it takes decades to build out/renovate.

Merry Christmas!

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