Sometimes I wonder how this all fits together- windows are the biggest thermal bridge of all time, including triple pane euro windows. All this effort and yet few people build monopoly houses and even fewer people submit to dark houses.i esp scratch my head where someone designs a “passiv house” that has several skylights ! And who forgoes all can lights on a second floor ? And if the goal is a healthy environment, how could you possibly consider have site mixed spray foam installed ?