OS-HPXML has built-in relationships between number of bedrooms and number of occupants, which is used to adjust various end uses (hot water, lighting, plug loads) for a given number of occupants since the fundamental equations from RESNET (or previously Building America) are based on number of bedrooms. See footnote 34 from ⁠here.

It'd be nice to look at how much the regressions would change if we had an individual regression for each building type. I.e., disaggregate MF from SFA and manufactured homes from SFD. It might provide more accurate results for certain building types.

@afontani @trynthink @ejhw