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Currently building a small (real small by US standards) 95 sqm. passive house in Romania. I dared to do this by myself as I'm a trained structural engineer (now a SW developer).

I can not emphasize enough on the energy efficiency of the house as energy costs are high. Take a look on how and why to build a passive house, it will change your life.

I can take a look here and see if you have one in your area... if it's a certified one you can visit it between 9-11 of Nov., this is a world wide event. More here: https://passivehouse-international.org/index.php?page_id=262

Also here you can find more info regarding passive houses in USA: https://naphnconference.com/