What do you make of the "Passive House" concept?

Hi, have you ever heard of the term “passive house”. It seems that this expression is a translation of the German word Passivhaus which describes a building that doesn’t need any external heating source. As far as I can see, the “Passivhaus” concept is especially popular in Germany.

What about your country, do you have many “passive houses”?

Many thanks,

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Of course, any way to save energy is good.

As I posted elsewhere, George W. Bush’s house in Texas is basically a “passive house”.