Here is the link to part 1 of six youtube videos that describe what is being learned with the latest and greatest residential housing in one of Canada’s coldest climates….10-11000 HDD if I recall correctly. The videos feature Peter Amerongen who is one of the principle designers and the builder involved.
https://www.youtube.com/watch?v=dE83EDZErm8&feature=related

All six videos are there but require a little searching…