I’d have to disagree with you on one point, which is that competing sets of facts or evidence do exist in many situations. In a murder trial, for example, the defense team may have evidence that points to innocence, and the prosecution presents evidence that points to guilt. Now weighing one body of evidence against the other, the judge or jury must decide where the line of “beyond a reasonable doubt” or “preponderance of evidence” lies. This is a matter a comparing one set of facts to another set of facts as objectively as possible against known standards and precedents, which, to me, is different than arguing pure opinions (“red is the best color” “no, I like green better”) and also different than inarguable bare facts (“12 people are in this room right now”). Idk, just my 2 cents on it, but to me there can be shades of reasonable debate on differing sets of evidence that aren’t covered by an opinion-fact dichotomy.

They aren’t “airtight”, that would awful. They are well-insulated and designed to take advantage of passive solar heating and air exchange cooling. The way roofs and windows and orientation on the land is usually done for western homes is just terribly inefficient for capturing and releasing heat in the right ways. Just some thick walls, a bank of windows facing the sunrise ,and some proper roof vents that can be opened when it’s hot is all most passive houses really are.