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For sure, and like any study its going to be bias towards its creator, but even some sort of frequency analysis I believe would be telling to say at the least
It’s going to be telling in certain places and under certain circumstances.
Some places require certain (high) insulation values for all new construction housing. Building housing in those places costs more. Neighboring states and municipalities that do not have those laws will have lower costs.
Similarly, some areas are in high demand. Housing there sells for a higher price.
It ain’t rocket surgery.